WiiOSC is a tiny Linux program to use the Nintendo Wii Controller as a control device for music programs.
It sends out the Wii data as OSC messages to a port of your choice, and can receive OSC data to turn on LEDs or the rumble.
love. it.
I'm using it in SOMba, my samba music generator program for dancers. Might rewrite it to more closely match what I need, but it's pretty awesome as it is.