I added a new app to my addiction down there. *points* It's Pandora Radio, but guess what? You can listen and use it online too. It's free!
How it works. You type in an artist, song or genre and it builds a radio station based on that. You can rate the songs it comes up with with a thumbs down or up (that helps the server choose the next songs). The only thing is, you can only skip so many songs an hour. But it's free. Free music on your computer anywhere.
Oh and you can shuffle between your personal radio stations too.
Check it out.