I've written a small PC dance mat game if anyone is interested you can get it here . The source is also available although the game will not compile on anything other than windows.

D'oh

www.cls-productions.net

do you need a dancemat??
If its anything of intrest
www.yov408.com
has a tutorial on motion detection with a web-cam.

no, a dance mat is not needed the cursor keys can be used. Infact it'll only work with the keyboard type dance mat.

I acutally used one of yov408's tutorials for the beat detection. So far it's had about 10 downloads so I doubt i'll be developing it any further.