Don't know if this is an old topic, butThe Link Put in a group and the "music genome project" populates your station. Pretty cool.
Yeah. Seriously. You put in a group and it constructs a radio "station" for you. I've done REM and now have "Toad the Wet Sprocket". It made me register (free) after the first 4 or 5 songs but so far it's been very user friendly.
I use it all the time at school. Its great. I have a James Brown channel, a Sublime channel and another one I cannot remember right now. The James brown channel is awesome.