A former colleague of mine designed and wrote much of this really very pretty and cool game:

http://www.shockwave.com/sw/content/bounce

You can download it and play it for free. What does it have to do with dance? It has pretty music, and its physics simulation as you try to arrange the balls kind of reminds me of unruly dancers in a rehearsal, or cat herding.

Be warned --- it's very addictive. Also, I should note that other than our former professional relationship, I have no connection to him or his game, financially or otherwise. It's just a nice, fun piece of work that I think people who like visual, spatial (albeit in 2D) structure, like dance fans, would enjoy.

--Andre