WebSideStory Responds To NetRatings’ Patent Infringement Litigation

SAN DIEGO, CA (Feb. 7, 2006) — WebSideStory, Inc. (Nasdaq: WSSI), a leading provider of
on-demand digital marketing applications, today responded to a lawsuit recently filed by NetRatings, Inc. in the United States District Court for the Southern District of New York. NetRatings, which has filed similar lawsuits against competing vendors over the past year, filed a lawsuit against WebSideStory alleging infringement of several patents owned by NetRatings. WebSideStory has reviewed the claims and believes they lack merit. WebSideStory intends to defend itself vigorously against the complaint.

“As a pioneer and technology leader in web analytics and digital marketing, WebSideStory takes intellectual property very seriously,” said Jeff Lunsford, chairman and CEO of WebSideStory. “However, we believe these claims have no merit. In addition, WebSideStory has issued U.S. patents of its own in the web analytics space. We are currently reviewing all of our legal options and intend to aggressively defend our position.”

For more information about WebSideStory, please visit www.websidestory.com.

About WebSideStory
Founded in 1996, WebSideStory, Inc. (Nasdaq: WSSI) is a leading provider of on-demand digital marketing applications that improve online marketing and sales. Its Active Marketing Suite(TM) consists of web analytics, site search, web content management and keyword bid management (scheduled for release in early 2006). WebSideStory is headquartered in San Diego, California, and has European headquarters in Amsterdam, The Netherlands. For more information, contact WebSideStory. Voice: 858.546.0040. Fax: 858.546.0480. Address: 10182 Telesis Court, 6th Floor, San Diego, CA 92121. Web site: www.WebSideStory.com. HBX and Active Marketing Suite are trademarks and WebSideStory is a registered trademark of WebSideStory. Other trademarks belong to their respective owners.

Forward-Looking Statements
Statements in this press release that are not a description of historical facts are forward-looking statements. You should not regard any forward-looking statement as a representation by WebSideStory that any of its plans will be achieved. Actual results may differ materially from those set forth in this release due to the risks and uncertainties inherent in WebSideStory’s business including, without limitation: WebSideStory’s reliance on its web analytics services for the majority of its revenue; blocking or erasing of cookies or limitations on our ability to use cookies; WebSideStory’s limited experience with digital marketing applications beyond web analytics; the risks associated with integrating the operations and products of Avivo Corporation with those of WebSideStory; privacy concerns and laws or other domestic or foreign regulations that may subject WebSideStory to litigation or limit our ability to collect and use Internet user information; the highly competitive markets in which we operate that could make it difficult for WebSideStory to acquire and retain customers; the risk that WebSideStory’s customers fail to renew their agreements; WebSideStory’s recent achievement of profitability and the risk that it may not maintain its profitability; the risk that WebSideStory’s services may become obsolete in a market with rapidly changing technology and industry standards; and other risks described in WebSideStory’s Securities and Exchange Commission filings, including WebSideStory’s annual report on Form 10-K for the year ended December 31, 2004, as amended, and quarterly report on Form 10-Q for the quarter ended September 30, 2005. Do not place undue reliance on these forward-looking statements which speak only as of the date of this news release. All forward-looking statements are qualified in their entirety by this cautionary statement, and WebSideStory undertakes no obligation to revise or update this news release to reflect events or circumstances after the date of this news release.

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