Daniel Howe has released TrackMeNot. a Firefox extension that sends a constant stream of search terms to various search engines to hide genuine seacrhes down in the noise. "With TrackMeNot, actual web searches, lost in a cloud of false leads, are essentially hidden in plain view. User-installed TrackMeNot works with the Firefox Browser and popular search engines, e.g. AOL, Yahoo!, Google, and MSN." The initial version isn't very secure against a determined adversary, but this should improve in the future.
