My day:
cloning
Pallo in C#
I added some extra stuff, namely, a screensaver-like mode, and resetting(by giving the zune a good flick)
It can be found here:
Download
If you really want the source, drop me a PM, though I have a feeling the
original makers might be interested in having the source for a quick port to
Windows phone. (I'm gonna send them an email in a day or two about it)
edit: you need to click "balls"(or "balls 2") in order to see the flash version. It seems that link doesn't work nicely.