Its a slow-ass site, but...

check out http://www.last.fm/user/dave_espionage/ to see what the hell I'm listening to, unless my music player is off, in which case you can see what I've been listening too in the past.

Its free and they have plugins for most major music players, a variety of platforms as well. Social networking based on music you listen to... haha. It'd be interesting to see how it works out, or if their site dies from server overload. Either way, looks like fun.