In the new version of Google Desktop 3 (which is coming out of beta today), we’ve fixed a few things from the beta, and we’re also introducing a new element that makes it more convenient to find what you're looking for by enabling you to search the web as well as your local computer, or email, as you type. We call it the Quick Search Box. It appears in the middle of your screen when you press the Ctrl button twice. When you don't need it, the Quick Search Box automatically hides or sits on your desktop, whichever you prefer.
Tools and Utilities
Product page: here