I am sorry to bother you with kinda advertisment. But one of my colleagues developed this LEDancer with his friend and it will bring dancing lights to your music.
Well the trailer is in german but i guess you all can see and hear what is meant 
I just heard a few times of their progress but didnt expected they are so much advanced already. Here is a preview:
You can use it with winamp and its pluggable to your PC via USB. I have already one prototype of it and i love it. Its a nice addon for parties and my friends wanted to have it as well
Its unique and no where else to get
OP if you dont want such posts here - feel free to delete it 
