Exhibit 32.1

CERTIFICATION PURSUANT TO

18 U.S.C. SECTION 1350,

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002 (Section 1350 of Chapter 63 of Title 18 of the United States Code), each of the undersigned officers of GSI Commerce, Inc. (the “Company”), does hereby certify with respect to the Quarterly Report on Form 10-Q for the period ended September 29, 2007 (the “Report”) that:

(1) The Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

(2) The information contained in the Report fairly presents, in all material respects, the financial condition and result of operations of the Company.

	By:	/s/ Michael G. Rubin
		Michael G. Rubin
		Chief Executive Officer
November 7, 2007
	By:	/s/ Michael R. Conn
		Michael R. Conn
		Chief Financial Officer

November 7, 2007

The foregoing certification is being furnished solely pursuant to Section 906 of the Sarbanes-Oxley Act of 2002 (Section 1350 of Chapter 63 of Title 18 of the United States Code) and is not being filed as part of the Report or as a separate disclosure document.