Google It

Google It! is a simple, unobtrusive widget used to search the content of your clipboard automatically on Google. It's a snap to setup and works on Windows Vista and XP running Microsoft's dot NET Framework 3. To use Google It!, copy any text from any program, the "Google It!" widget will appear, click on it, it will then automatically search the content of the clipboard on Google.

requirement: WinXP, Vista, +.NET 3
Link for download and video tutorial :http://www.zypto.com/labs/googleit/