UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549
                                  SCHEDULE 14A

PROXY STATEMENT PURSUANT TO SECTION 14(A) OF THE SECURITIES EXCHANGE ACT OF 1934
                                (AMENDMENT NO. )

Filed by the Registrant |_|

Filed by a Party other than the Registrant |X|

Check the appropriate box:

|_|   Preliminary Proxy Statement
|_|   Confidential, for Use of the Commission Only (as permitted by
      Rule 14a-6(e)(2))
|_|   Definitive Proxy Statement
|_|   Definitive Additional Materials
|X|   Soliciting Material Pursuant to Section 240.14a-12

                                 INFOSPACE, INC.
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                (Name of Registrant as Specified In Its Charter)

                         SANDELL ASSET MANAGEMENT CORP.
                       CASTLERIGG MASTER INVESTMENTS LTD.
                        CASTLERIGG INTERNATIONAL LIMITED
                    CASTLERIGG INTERNATIONAL HOLDINGS LIMITED
                     CASTLERIGG GLOBAL SELECT FUND, LIMITED
                                    CGS, LTD.
                          CASTLERIGG GS HOLDINGS, LTD.
                                THOMAS E. SANDELL
                                  NICK GRAZIANO
                                JONATHAN R. MACEY
                                 PAUL L. SCHAUT
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    (Name of Person(s) Filing Proxy Statement, if other than the Registrant)






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     On April 16, 2007, Sandell Asset Management Corp. issued a press release,
a copy of which is filed herewith as Exhibit 1.