Google Desktop Search - find everything on your pc
|I couldn't try this one out because it only
works with Windows XP, but I've heard lots of good things about it and I
trust Google labs.
Website - Quote from the website
Google Desktop Search is how our brains would work if we had photographic memories. It's a desktop search application that provides full text search over your email, computer files, chats, and the web pages you've viewed. By making your computer searchable, Google Desktop Search puts your information easily within your reach and frees you from having to manually organize your files, emails, and bookmarks.