wii-theremin

speaking of taking yourself too seriously...

Here's a video where the maker of a wii-mote based theremin explains how it works. He's using the infra-red sensor of the wii-mote to determine the position of two markers (one on each hand). He then maps the position of one marker to pitch, the other to volume to create a theremin type instrument.
It doesn't have to stop there - the mapping could be done so that the two markers control any parameter of the sound - giving you expressive control over any sound.

Grainface laptop performance

Here's a video of a german laptop ensemble giving a performance.
The music is quite 'ambient' with long sustained tones and then short percussive elements introduced throughtout - there's also some vocoding going on.
Musically, it's not everyone's cup of tea and the performers do look like they're taking themselves a little too seriously at times. But they use wii-motes as gestural input devices to control the sound and the link between their actions and the sounds being generated is pretty obvious - so worth a look...