TrackMeNot: Would this really make a difference? Probably not, but it’s an interesting idea.
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 ‘ghost’ queries, significantly increasing the difficulty of aggregating such data into accurate or identifying user profiles.
I'm gonna go with Bruce Schneier on this one - it's worthless http://www.schneier.com/blog/archives/2006/08/trackmenot_1.html
TrackMeNot sucks. I got it the first day it came out, and immediatly I got 69 viruses and my computer crashed then caught on fire.