i may be late to the game on this one but i found an online radio station much better than the others i've tried. it is called pandora.com. link below. the feature allowing you to create multiple stations based on artists you like and adding the stations to a mix list has been pretty cool. i know this sounds like an ad but this site has helped me find new artists and ones i had forgotten about. anyhow here is the link.

http://www.pandora.com/