EXHIBIT 23.4 CONFIDENTIAL July 22, 1999 Marla Kammer Jupiter Communications 627 Broadway New York, NY 10012 By facsimile to 212-780-6075 Dear Marla: I am writing at the suggestion of Steve Gross, our account manager at Jupiter Communications. We would like to include a reference to Jupiter and certain data contained in your research reports regarding affiliate marketing, as attached in Exhibit A, in a registration statement to be filed by our company --------- with the Securities and Exchange Commission ("SEC") regarding a proposed initial public offering. We request that you kindly sign below to indicate your consent to such references and your agreement to permit us to file such consent with the SEC if needed. Please return the signed copy to me by fax (508-357-8880) and send the original to me via regular mail. If you have any questions regarding this matter, please call me at (508) 357-8888. Lastly, we request that you treat the foregoing information as strictly confidential until we file a registration statement with the SEC. Thank you for your help. Warmest regards, Thomas A. Gerace Executive Vice President Acknowledgement: Jupiter Communications, LLC /s/ Marla Kammer - ---------------------------- By: Marla Kammer Title: Director of Production Date: 7/23/99 EXHIBIT A: Reference REFERENCE: "Among merchants that do have affiliate programs, 17% of total sales, on average, are driven by affiliates."