pandora.com is fucking brilliant. Type in a song you like - or a band or singer and it will play you a selection of similar atists or songs and create your own radio station. Right now I am listening to Bob Dylan Radio and it's playing Vince Martin and just played The Allman Bros.
..Once its created your radio you can see who else is listening to your songs. A lovely super nosy feature.
It has just played me Michael Talbott & The Wolfkings.