UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549


                                  SCHEDULE 13G

                    UNDER THE SECURITIES EXCHANGE ACT OF 1934
                                (AMENDMENT NO. 3)

                                 USG CORPORATION
                                (Name of Issuer)

                          Common Stock, $0.10 par value
                         (Title of Class of Securities)

                                    903293405
                                 (CUSIP Number)

                                December 31, 2005
                      (Date of Event Which Requires Filing
                               of this Statement)



Check the appropriate box to designate the rule pursuant to which this Schedule
is filed:

                  [   ]       Rule 13d-1(b)
                  [ x ]       Rule 13d-1(c)
                  [   ]       Rule 13d-1(d)



  *The remainder of this cover page shall be filled out for a reporting person's
  initial filing on this form with respect to the subject class of securities,
  and for any subsequent amendment containing information which would alter the
  disclosures provided in a prior cover page.

  The information required in the remainder of this cover page shall not be
  deemed to be "filed" for the purpose of Section 18 of the Securities Exchange
  Act of 1934 ("Act") or otherwise subject to the liabilities of that section of
  the Act but shall be subject to all other provisions of the Act (however, see
  the Notes).




-----------------------                              -------------------------
CUSIP No. 903293405                   13G            Page  2   of  9     Pages
          -------------                                   ----    ------
-----------------------                              -------------------------

--------------------------------------------------------------------------------
        1  NAME OF REPORTING PERSON
           I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

           D. E. Shaw Laminar Portfolios, L.L.C. - (IRS Identification No.
           01-0577802)
--------------------------------------------------------------------------------
        2  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                                       (a)  / /

                                                                       (b)  / /
--------------------------------------------------------------------------------
        3  SEC USE ONLY

--------------------------------------------------------------------------------
        4  CITIZENSHIP OR PLACE OF ORGANIZATION

           Delaware
--------------------------------------------------------------------------------
      NUMBER OF          5  SOLE VOTING POWER
        SHARES
     BENEFICIALLY           0
        OWNED
          BY          ----------------------------------------------------------
         EACH            6  SHARED VOTING POWER
      REPORTING
        PERSON              2,092,100
         WITH         ----------------------------------------------------------
                         7  SOLE DISPOSITIVE POWER

                            0
                      ----------------------------------------------------------
                         8  SHARED DISPOSITIVE POWER

                            2,092,100

--------------------------------------------------------------------------------
        9  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

           2,092,100
--------------------------------------------------------------------------------
       10  CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES

           / /

--------------------------------------------------------------------------------
       11  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)

           4.7%
--------------------------------------------------------------------------------
       12  TYPE OF REPORTING PERSON*

           OO
--------------------------------------------------------------------------------
                       *SEE INSTRUCTION BEFORE FILLING OUT




-----------------------                              -------------------------
CUSIP No. 903293405                   13G            Page  3   of  9     Pages
          -------------                                   ----    ------
-----------------------                              -------------------------

--------------------------------------------------------------------------------
        1  NAME OF REPORTING PERSON
           I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

           D. E. Shaw & Co., L.P. - (IRS Identification No. 13-3695715)
--------------------------------------------------------------------------------
        2  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*

                                                                       (a)  / /

                                                                       (b)  / /
--------------------------------------------------------------------------------
        3  SEC USE ONLY

--------------------------------------------------------------------------------
        4  CITIZENSHIP OR PLACE OF ORGANIZATION

           Delaware
--------------------------------------------------------------------------------
      NUMBER OF          5  SOLE VOTING POWER
       SHARES
    BENEFICIALLY            0
        OWNED        -----------------------------------------------------------
         BY              6  SHARED VOTING POWER
        EACH
      REPORTING             3,814,500
       PERSON        -----------------------------------------------------------
        WITH             7  SOLE DISPOSITIVE POWER

                            0
                     -----------------------------------------------------------
                         8  SHARED DISPOSITIVE POWER

                            3,819,700
--------------------------------------------------------------------------------
        9  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

           3,819,700
--------------------------------------------------------------------------------
       10  CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES

           / /

--------------------------------------------------------------------------------
       11  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)

           8.6%
--------------------------------------------------------------------------------
       12  TYPE OF REPORTING PERSON*

           IA, PN
--------------------------------------------------------------------------------
                       *SEE INSTRUCTION BEFORE FILLING OUT



-----------------------                              -------------------------
CUSIP No. 903293405                   13G            Page  4   of  9     Pages
          -------------                                   ----    ------
-----------------------                              -------------------------


--------------------------------------------------------------------------------
        1  NAME OF REPORTING PERSON
           I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

           D. E. Shaw & Co., L.L.C. - (IRS Identification No. 13-3799946)
--------------------------------------------------------------------------------
        2  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*

                                                                       (a)  / /

                                                                       (b)  / /
--------------------------------------------------------------------------------
        3  SEC USE ONLY

--------------------------------------------------------------------------------
        4  CITIZENSHIP OR PLACE OF ORGANIZATION

           Delaware
--------------------------------------------------------------------------------
      NUMBER OF          5  SOLE VOTING POWER
       SHARES
    BENEFICIALLY            0
        OWNED        -----------------------------------------------------------
         BY              6  SHARED VOTING POWER
        EACH
      REPORTING             2,964,100
       PERSON        -----------------------------------------------------------
        WITH             7  SOLE DISPOSITIVE POWER

                            0
                     -----------------------------------------------------------
                         8  SHARED DISPOSITIVE POWER

                            2,964,100
--------------------------------------------------------------------------------
        9  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

           2,964,100
--------------------------------------------------------------------------------
       10  CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES

           / /

--------------------------------------------------------------------------------
       11  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)

           6.7%
--------------------------------------------------------------------------------
       12  TYPE OF REPORTING PERSON*

           00
--------------------------------------------------------------------------------
                       *SEE INSTRUCTION BEFORE FILLING OUT




-----------------------                              -------------------------
CUSIP No. 903293405                   13G            Page  5   of  9     Pages
          -------------                                   ----    ------
-----------------------                              -------------------------


--------------------------------------------------------------------------------
        1  NAME OF REPORTING PERSON
           I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

           David E. Shaw
--------------------------------------------------------------------------------
        2  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                                       (a)  / /

                                                                       (b)  / /
--------------------------------------------------------------------------------
        3  SEC USE ONLY

--------------------------------------------------------------------------------
        4  CITIZENSHIP OR PLACE OF ORGANIZATION

           United States
--------------------------------------------------------------------------------
      NUMBER OF          5  SOLE VOTING POWER
       SHARES
    BENEFICIALLY            0
        OWNED        -----------------------------------------------------------
         BY              6  SHARED VOTING POWER
        EACH
      REPORTING             3,814,500
       PERSON        -----------------------------------------------------------
        WITH             7  SOLE DISPOSITIVE POWER

                            0
                     -----------------------------------------------------------
                         8  SHARED DISPOSITIVE POWER

                            3,819,700
--------------------------------------------------------------------------------
        9  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

           3,819,700
--------------------------------------------------------------------------------
       10  CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES

           / /
--------------------------------------------------------------------------------
       11  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)

           8.6%
--------------------------------------------------------------------------------
       12  TYPE OF REPORTING PERSON*

           IN
--------------------------------------------------------------------------------
                       *SEE INSTRUCTION BEFORE FILLING OUT





ITEM 1(A)         NAME OF ISSUER:

                  USG Corporation

ITEM 1(B)         ADDRESS OF ISSUER'S PRINCIPAL EXECUTIVE OFFICES:

                  125 S. Franklin Street
                  Department 188
                  Chicago, IL  60606


ITEM 2(A)         NAME OF PERSON FILING:

                  D. E. Shaw Laminar Portfolios, L.L.C.
                  D. E. Shaw & Co., L.P.
                  D. E. Shaw & Co., L.L.C.
                  David E. Shaw


ITEM 2(B)         ADDRESS OF PRINCIPAL BUSINESS OFFICE:

                  The business address for all filers is:
                  120 W. 45th Street, Tower 45, 39th Floor
                  New York, NY 10036

ITEM 2(C)         CITIZENSHIP:

                  D. E. Shaw Laminar Portfolios, L.L.C. is a limited liability
                  company organized under the laws of the state of Delaware.
                  D. E. Shaw & Co., L.P. is a limited partnership organized
                  under the laws of the state of Delaware.
                  D. E. Shaw & Co., L.L.C. is a limited liability company
                  organized under the laws of the state of Delaware.
                  David E. Shaw is a citizen of the United States of America.

ITEM 2(D)         TITLE OF CLASS OF SECURITIES:

                  Common Stock, $0.10 par value (the "Shares")

ITEM 2(E)         CUSIP NUMBER:

                  903293405

ITEM 3            Not Applicable


ITEM 4            OWNERSHIP:

                  As of the close of business on December 31, 2005:

                  (a) Amount beneficially owned:


                                                                 
                  --------------------------------------------------------------------------------------------------
                  D. E. Shaw Laminar Portfolios, L.L.C.:            2,092,100 Shares

                  --------------------------------------------------------------------------------------------------
                  D. E. Shaw & Co., L.P.:                           3,819,700 Shares
                                                                    This is composed of (i) 747,900 in the name of
                                                                    D. E. Shaw Valence Portfolios, L.L.C., (ii)
                                                                    102,500 in the name of D. E. Shaw Valence,
                                                                    L.L.C., (iii) 2,092,100 shares in the name of
                                                                    D. E. Shaw Laminar Portfolios, L.L.C., (iv)
                                                                    872,000 shares in the name of D. E. Shaw
                                                                    Oculus Portfolios, L.L.C., and (v) 5,200
                                                                    shares under the management of D. E. Shaw
                                                                    Investment Management, L.L.C.
                  --------------------------------------------------------------------------------------------------
                  D. E. Shaw & Co., L.L.C.:                         2,964,100 Shares
                                                                    This is composed of (i) 2,092,100 shares in
                                                                    the name of D. E. Shaw Laminar Portfolios,
                                                                    L.L.C. and (ii) 872,000 shares in the name of
                                                                    D. E. Shaw Oculus Portfolios, L.L.C.
                  --------------------------------------------------------------------------------------------------
                  David E. Shaw:                                    3,819,700 Shares
                                                                    This is composed of (i) 747,900 in the name of
                                                                    D. E. Shaw Valence Portfolios, L.L.C., (ii)
                                                                    102,500 in the name of D. E. Shaw Valence,
                                                                    L.L.C., (iii) 2,092,100 shares in the name of
                                                                    D. E. Shaw Laminar Portfolios, L.L.C., (iv)
                                                                    872,000 shares in the name of D. E. Shaw
                                                                    Oculus Portfolios, L.L.C., and (v) 5,200
                                                                    shares under the management of D. E. Shaw
                                                                    Investment Management, L.L.C.
                  --------------------------------------------------------------------------------------------------



                                                                                 
                  (b) Percent of class:

                  D. E. Shaw Laminar Portfolios, L.L.C.:                            4.7%
                  D. E. Shaw & Co., L.P.:                                           8.6%
                  D. E. Shaw & Co., L.L.C.:                                         6.7%
                  David E. Shaw:                                                    8.6%

                  (c) Number of Shares to which the person has:

                  (i) Sole power to vote or to direct the vote:

                  D. E. Shaw Laminar Portfolios, L.L.C.:                            -0-
                  D. E. Shaw & Co., L.P.:                                           -0-
                  D. E. Shaw & Co., L.L.C.:                                         -0-
                  David E. Shaw:                                                    -0-

                  (ii) Shared power to vote or to direct the vote:

                  D. E. Shaw Laminar Portfolios, L.L.C.:                            2,092,100 Shares
                  D. E. Shaw & Co., L.P.:                                           3,814,500 Shares
                  D. E. Shaw & Co., L.L.C.:                                         2,964,100 Shares
                  David E. Shaw:                                                    3,814,500 Shares

                  (i) Sole power to dispose or to direct the disposition of:

                  D. E. Shaw Laminar Portfolios, L.L.C.:                            -0-
                  D. E. Shaw & Co., L.P.:                                           -0-
                  D. E. Shaw & Co., L.L.C.:                                         -0-
                  David E. Shaw:                                                    -0-


                  (ii) Shared power to dispose or to direct the disposition of:

                  D. E. Shaw Laminar Portfolios, L.L.C.:                            2,092,100 Shares
                  D. E. Shaw & Co., L.P.:                                           3,819,700 Shares
                  D. E. Shaw & Co., L.L.C.:                                         2,964,100 Shares
                  David E. Shaw:                                                    3,819,700 Shares



                  David E. Shaw does not own any shares directly. By virtue of
                  David E. Shaw's position as President and sole shareholder of
                  D. E. Shaw & Co., Inc., which is the general partner of
                  D. E. Shaw & Co., L.P., which in turn is the managing member
                  and investment adviser of D. E. Shaw Valence Portfolios,
                  L.L.C., the managing member of D. E. Shaw Valance, L.L.C. and
                  D. E. Shaw Investment Management, L.L.C., and the investment
                  adviser of D. E. Shaw Laminar Portfolios, L.L.C. and
                  D. E. Shaw Oculus Portfolios, L.L.C., and by virtue of
                  David E. Shaw's position as President and sole shareholder of
                  D. E. Shaw & Co. II, Inc., which is the managing member of
                  D. E. Shaw & Co., L.L.C., which in turn is the managing member
                  of D. E. Shaw Laminar Portfolios, L.L.C. and D. E. Shaw Oculus
                  Portfolios, L.L.C., David E. Shaw may be deemed to have the
                  shared power to vote or direct the vote of 3,814,500 shares,
                  and the shared power to dispose or direct the disposition of
                  3,819,700 shares, the 3,819,700 shares as described above
                  constituting 8.6% of the outstanding shares and, therefore,
                  David E. Shaw may be deemed to be the beneficial owner of such
                  shares. David E. Shaw disclaims beneficial ownership of such
                  3,819,700 shares.

ITEM 5            OWNERSHIP OF FIVE PERCENT OR LESS OF A CLASS:

                  If this statement is being filed to report the fact that as of
                  the date hereof the reporting person has ceased to be the
                  beneficial owner of more than five percent of the class of
                  securities, check the following.

ITEM 6            OWNERSHIP OF MORE THAN FIVE PERCENT ON BEHALF OF
                  ANOTHER PERSON:

                  Not Applicable

ITEM 7            IDENTIFICATION AND CLASSIFICATION OF THE SUBSIDIARY WHICH
                  ACQUIRED THE SECURITY BEING REPORTED ON BY THE PARENT
                  HOLDING COMPANY:

                  Not Applicable

ITEM 8            IDENTIFICATION AND CLASSIFICATION OF MEMBERS OF THE GROUP:

                  Not Applicable

ITEM 9            NOTICE OF DISSOLUTION OF GROUP:

                  Not Applicable

ITEM 10           CERTIFICATION:

                  By signing below, each of D. E. Shaw Laminar Portfolios,
                  L.L.C., D. E. Shaw & Co., L.P., D. E. Shaw & Co., L.L.C., and
                  David E. Shaw certify that, to the best of such reporting
                  person's knowledge and belief, the securities referred to
                  above were not acquired and are not held for the purpose of or
                  with the effect of changing or influencing the control of the
                  issuer of the securities and were not acquired and are not
                  held in connection with or as a participant in any transaction
                  having such purposes or effect.






                                    SIGNATURE

         After reasonable inquiry and to the best of their knowledge and belief,
the undersigned certify that the information set forth in this statement is
true, complete, and correct. Powers of Attorney, dated February 24, 2004 granted
by David E. Shaw in favor of Eric Wepsic, are attached hereto.


Dated:  February 3, 2006






                                       D. E. Shaw Laminar Portfolios, L.L.C.

                                       By: D. E. Shaw & Co., L.L.C.,
                                       as managing member

                                             By: /s/ Eric Wepsic
                                                -------------------
                                                Eric Wepsic
                                                Managing Director


                                       D. E. Shaw & Co., L.P.

                                       By: /s/ Eric Wepsic
                                           -------------------
                                           Eric Wepsic
                                           Managing Director


                                       D. E. Shaw & Co., L.L.C.

                                       By: /s/ Eric Wepsic
                                           -------------------
                                           Eric Wepsic
                                           Managing Director


                                       David E. Shaw

                                       By: /s/ Eric Wepsic
                                           -------------------
                                           Eric Wepsic
                                           Attorney-in-Fact for David E. Shaw





                                    EXHIBIT 1

                                POWER OF ATTORNEY
                               FOR CERTAIN FILINGS
                    UNDER THE SECURITIES EXCHANGE ACT OF 1934


I, David E. Shaw, hereby make, constitute and appoint each of:


         Anne Dinning,

         Julius Gaudio,

         Lou Salkind,

         Stuart Steckler, and

         Eric Wepsic,

acting individually, as my agent and attorney-in-fact, with full power of
substitution, for the purpose of, from time to time, executing in my name and/or
my capacity as President of D. E. Shaw & Co., Inc. (acting for itself or as the
general partner of D. E. Shaw & Co., L. P. and general partner or managing
member of other entities, any which in turn may be acting for itself or other
entities) all documents, certificates, instruments, statement, other filings,
and amendments to the forgoing (collectively, "documents") determined by such
person to be necessary or appropriate to comply with ownership or control-person
reporting requirements imposed by any United States or non-United States
governmental or regulatory authority, including without limitation Forms 3, 4,
5, 13D, 13F, and 13G required to be filed with the Securities and Exchange
Commission; and delivering, furnishing or filing any such documents with the
appropriate governmental or regulatory authority. Any such determination shall
be conclusively evidenced by such person's execution, delivery, furnishing,
and/or filing of the applicable document.

This power of attorney shall be valid from the date hereof and replaces the
power granted on February 5, 2001, which is hereby cancelled.

IN WITNESS HEREOF, I have executed this instrument as of the date set forth
below.

Date: February 24, 2004

DAVID E. SHAW, as President of
D. E. Shaw & Co., Inc.
/s/David E. Shaw
New York, New York






                                POWER OF ATTORNEY
                               FOR CERTAIN FILINGS
                    UNDER THE SECURITIES EXCHANGE ACT OF 1934


I, David E. Shaw, hereby make, constitute and appoint each of:

         Anne Dinning,

         Julius Gaudio,

         Lou Salkind,

         Stuart Steckler, and

         Eric Wepsic,

acting individually, as my agent and attorney-in-fact, with full power of
substitution, for the purpose of, from time to time, executing in my name and/or
my capacity as President of D. E. Shaw & Co. II, Inc. (acting for itself and as
the managing member of D. E. Shaw & Co., L.L.C., which in turn may be acting for
itself or as the managing member of other companies) all documents,
certificates, instruments, statement, other filings and amendments to the
forgoing (collectively, "documents") determined by such person to be necessary
or appropriate to comply with ownership or control-person reporting requirements
imposed by any United States or non-United States governmental or regulatory
authority, including without limitation Forms 3, 4, 5, 13D, 13F and 13G required
to be filed with the Securities and Exchange Commission; and delivering,
furnishing or filing any such documents with the appropriate governmental or
regulatory authority. Any such determination shall be conclusively evidenced by
such person's execution and delivery, furnishing or filing of the applicable
document.

This power of attorney shall be valid from the date hereof and replaces the
power granted on February 5, 2001, which is hereby cancelled.

IN WITNESS HEREOF, I have executed this instrument as of the date set forth
below.

Date:  February 24, 2004

DAVID E. SHAW, as President of
D. E. Shaw & Co. II, Inc.
/s/ David E. Shaw
New York, New York