googling your desktop!
if you believe that google is the best tool to search the web, wait ’till you find out if it tries to search your desktop! once it is installed, it automatically indexes your pc and your search results would look like that of the google web page search except that it would indicate if the result was from an email, a page, a document, even from a zip file.
aside from the quick searches, it has other pretty kewl gadgets, which you can readily download, such as news, email, weather forecasts, photos, webclips, sports news, and more.
one drawback i see here though is that it’s quite resource intensive (vista sidebar i guess is much better), plus there where questions like security (but you cant turn off this feature so that your computer will not be public for searching).
learn more here.