A few weeks ago I discovered the amazing new search engine by Microsoft. It uses Silverlight of course, and it is sort of beautiful (they improved over their initial design that looked quite childish). The main fun begins when you choose the Tree view. You actually see a tree with search results hanging like fruits. The tree spins slowly, so that you can wait till the link you want moves closer and then pick it. If you are overwhelmed by the quantity of the results, you can move the slider at the bottom, and the less relevant results will disappear.
Visit http://www.tafiti.com/ and see yourself.