Via Ron K. Jeffries' great blog Cloudy Thinking:
Just when you thought the well of neat UI and desktop metaphor ideas might run dry, here's a very cool video of 3D desktop prototype called BumpTop. Very very cool. Some of the concepts like the 'lasso and stroke' command interface could be applicable in a wide range of applications not just desktop organization. It's kind of like mouse gestures (something I could never quite get the hang of) only with visual feedback which vastly improves it.