Nifty. I love this little program!
One suggestion: could you possibly make it so that ALL of the balls are user-movable? That would make this little gem an even better timewaster...
[edit]It's already been suggested, but an option for multiple camera angles would be nice too. Then again, I can't program games very well, so I have no idea how hard it would be to do. Again, great job.[/edit]