People who haven't already tried Google Desktop Search, try it soon!
It's a desktop search application that provides full text search over your email, computer files, chats, and the web pages you've viewed. It also copies the item's content into its cache, so that you'll be able to find and see long-finished chats and older versions of files and web pages.

U can download it from: http://desktop.google.com/

Looks nice !