http://www.pandora.com/I dont know if this has been mentioned before, but I was just turned on to this site. Its a free site that creates a radio station for you if you enter the band or song. It'll play a song from your initial group and then play a few other songs from other bands that are similiar and it'll even tell you why its playing those choices.
Ex.,,,,,I typed in the artist "LOVE" and they started me out with 'Que Vida' from LOVE and then went into 'You Aint Tuff' from the Uniques and then 'Jasontown' by Michael Yonkers and now its playing 'Touch Of Red' by Bent Wind.
Awesome site.