Last.fm - More of the music you love
I created a last.fm account today. Last.fm is a social music website that is designed to play music based on your behaviour while you listen. If you fast forward a song, it gets that you don't want to listen to it. If you listen to a full song, it gets that you dig that song. I started adding artists to my account. After a couple of hours fast forwarding songs I don't like, and adding more artists I do like it never stops playing songs I love, for free! How good is that? Right now it's playing one of my fav No Doubt songs.