Google Desktop: Make Your Way Simple

Google Desktop is desktop search software made by Google for Mac OS X, Linux, and Microsoft Windows. The program allows text searches of a user's e-mails, computer files, music, photos, chats, Web pages viewed, and other "Google Gadgets."
The Sidebar comes pre-installed with the following gadgets:

* Email - a panel which lets one view one's Gmail messages.
* Scratch Pad - here one can store notes; they are saved automatically
* Photos - displays a slideshow of photos from the "My Pictures" folder (address can be changed)
* News - shows the latest headlines from Google News, and how long ago they were written. The News panel is personalized depending on the type of news you read.
* Weather - shows the current weather for a location specified by the user.
* Web Clips - shows recent posts from RSS news feeds.
* Google Talk - If Google Talk is installed, double clicking the window title will dock it to one's sidebar.

You can Find Many other Gadgets here.