Yeah, the demo looks really sweet. Spinning windows, nicely scaled video, concurrent video windows, odd-shaped windows, book-shelf window stacking. I highly recommend checking out the demo video at Sun's site if you haven't seen it. I'm sure it requires major horsepower and the demo is probably very, very finely tuned to give the best first-look. But... if it actually performs the way they say it will, that OS will be a serious contender.