http://www.thinkgeek.com/computing/accessories/5ca2/ found this .. I'm sure it can be put to good moding use ... but its not cheap ($44.99 +postage to UK) would it be possible to build one out of old hifi donor part?
You can get them in the UK http://www.kustompcs.co.uk/acatalog/Kustom_PCs_Shop_Misc_Input_Devices_81.html They are very tasty , the silver version is nicer in the flesh than the black one
I've had one for a while... very nice - quite macish. The light increases in intensity as you turn the volume up. They're really well built and you'd probably struggle to make something with as nice an action. They are expensive for what they are though. Gordy's right the silver one is the nicest jSj
Not much to be honest bit of an impluse purchase... went something alone the lines of... 'oooh it's shiney, and has a blue pulsating light.... must have...'
I use mine as a very expensive volume control knob I press down for mute and twist for volume up/down. I don't use it for much else really