Now here's a clever idea: a
combination MP3 player/USB hard drive. Presumably it behaves
like any USB storage device and thus works with anything USB-friendly including
Linux, MacOS X and even weirder OSes. Unfortunately, when you read the fine
print, it emerges that it doesn't actually record (i.e., digitise audio) as
such, but only plays MP3s from the disk. Otherwise it would make a very nifty
portable hard disk recorder.