I posted about Audioscrobbler ages ago. It is a service that tracks what music you play on your computer so that you can see what artists/songs you listen to the most. It also tries to recommend music to you based on what your profile (here's mine). An added bonus is getting to listen to a radio station based on other users with similar profiles, or one with your profile at last.fm.

So, I've added a link to listen to my radio on the left that looks like this: . So give a listen and enjoy.