This Firefox extension offers users an interesting approach to block data miners, but it requires a leap of faith that the program is actually living up to its promises.
TrackMeNot’s user interface consists of an icon on your status bar. A right-click displays a menu where you can choose to enable the program, along with your Options and Help menus. The Options menu lets you set the query frequency and how to handle cookies. The program supposedly hides your search history by running its own fake queries through popular search engines with the idea of fooling data miners. Random words appear in your status bar and give the appearance that the program is working; but beyond that, there’s no way to tell what TrackMeNot is doing. The program doesn’t include a feature for monitoring data mining activity.
TrackMeNot shouldn’t be your only line of defense, but it might help throw data miners off track.