From BoingBoing a few days ago:

“TrackMeNot: Firefox extension randomizes your search history – Stephen sez, ‘TrackMeNot runs in Firefox as a low-priority background process that periodically issues randomized search-queries to popular search engines, e.g., AOL, Yahoo!, Google, and MSN. It hides users’ actual search trails in a cloud of indistinguishable ‘ghost’ queries, making it difficult, if not impossible, to aggregate such data into accurate or identifying user profiles. TrackMeNot integrates into the Firefox ‘Tools’ menu and includes a variety of user-configurable options.'”

From BoingBoing today:

“Greasemonkey script feeds all your searches through anonymizer

– Nemanja made this Greasemonkey script that automatically feeds all your search-queries through Black Box Search, ‘a proxy that runs Google, Yahoo, and MSN searches through a proxy and then displays them with almost no delay.'”