You may have noticed that a few people are blogging about Blendie right now – the blender that you growl at to make it go.
If you like the idea then try downloading Racing Pitch – a prototype PC game from Skinflake that works on the same principle. You make an engine noise into your microphone to make your car go. Your pitch determines your speed, and if you ‘accelerate’ too fast, you make your car skid.
It’s only a proof-of-concept but it’s quite fun, and when the novelty of playing it wears off, you can watch your friends making a fool out of themselves. All in the name of interaction design research!