Pandora Internet Radio - Find New Music, Listen to Free Web Radio

Neat little site (thanks to Jeff for the recommendation): Pandora allows one to enter one's favorite artists, songs, etc., and it then "builds" a customized "radio station" based on those preferences, potentially exposing you to new songs/artists that you're more likely to find appealing based on your expressed preferences. One can help the service "learn" by saying 'I do' or 'I don't' like the current song.

Worth checking out -- www.pandora.com. I know there are similar services out there, this is the first I've tried.

Pandora Internet Radio - Find New Music, Listen to Free Web Radio