Ever since I found Phun (about a week) I've been wanting to put together a clock like this. I finally finished it, and it involved a lot more experimenting, tweaking, etc. than I had thought.
You can download the .phn file and a good quality video at: http://www.casualhacker.net/blog/2008/02/phun-clock-with-balls/
Phun is a 2D physics simulator that you can download from http://www.acc.umu.se/~emilk/
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I play around ith Phun alot, but I never do awesome stuff like that.
maybe i set it on youtube it's much better :P