Quite an interesting site for connecting to people who listen to similar music as you. It submits tracks listened to in iTunes/winamp/etc. to generate music charts based on listening habits. I do not use it for musical suggestions because I always get things like "Icon of Coil, Combi, blah blah".
http://www.last.fm/user/Vorbedacht/
(-edit)
There is a button near the top which changes the default interface from red to grey. The default red layout is a bit hard on the eyes.