Here’s a pretty amazing demo by Mark Mahoney called Browser Ball. The browser ball is a special ball that can magically change which window it’s on. By using a series of overlayed windows, you can have the ball bouncing all over your screen!
Browser Ball attempts, with only moderate success, to allow the configuration of a seemingly endless array of continuous spaces using multiple overlapping browser windows. Within this multivariate space, users are invited to toss a beach ball both hither and yon. If this sounds like a ridiculous use of everyone’s time, that’s only because it is.
Browser Ball works best in Chrome, but seems to work pretty well in Firefox 3 too!