On the bottleneck guitar thread someone mentioned MPEG and exchanging sound clips via this technology. I posted a link to this FTP site for MPEG shareware there and am duplicating it here for you non-bottleneckers who might be interested. I downloaded the mpgaudio.exe self-extracting zip file, installed it, and used it to play some hardanger fiddle files I'd gotten from somewhere.

I believe MPEG is a more efficient compression than say, zipping a .wav file. Anyone have any data on that?