Pandora
Check out Pandora.com.
You enter a song or group that you like, and it forms a radio station based around that sound. If you register, you can save up to 100 stations, or you can just enter a band each time you go.
It really works. Also, as you listen, you can tell Pandora if the song it is playing is something you like or don't like, to help it learn. Give it a try.
