Stolen from Slashdot..

http://musicbrainz.org/index.html

Looks like a CDDB/freedb-like system for automatically tagging music files and adding metadata. They're also coupling it with an audio fingerprint engine to help identify songs automatically. Not the first time this has been done, I know someone on the board was involved with a company who did that sort of stuff, but it's interesting to see another one launch, and couple it with a pretty damn large database.

Not sure about their tagging software, though, and, of course, it's only available for Win32.