Pandora

I don't know how many of you know about it, but there is a beautiful "musical discovery service" called PANDORA on the web that works like this: after you have chosen a song or an artist you like, Pandora creates a station which plays songs that are considered similar to the artist/s you chose. It is really simple and fun (it is like listening to a radio channel that can never really let you down). It is also possible to tell Pandora wheter you like the song it is playing or not (and in doing so Pandor won't play that artist again).

By the way, from now you can find it among my links too.