This is probably of interest to about two people here, including me, but anyway.

You know those cheap roll-up USB keyboards and drumpads you see around the place?  Someone got around to writing a Mac "driver" for them.

http://www.insightful-schmidt.info/dreamcheekymusic/

I say "driver" because it's a program that runs in the Terminal and translates USB to MIDI - which I thought was a neat workaround.

Intel, 10.4 and up.