Derek dotted this a while ago, but if you didnt see it... For those who have to sit at a computer and dont have there ipod on them, you can create your own "radio station" by typing in an artist or song and it will feed your "station" with songs or artists closely related to your search; you can create as many "stations" as you want... pretty cool, you do have to create a user name.

Quoted: Pandora radio is the personalized internet radio service that helps you find new music based on your old and current favorites. Create custom web radio stations, listen free.