YouTube Disco

Looks like YouTube now has an answer to Pandora and Last.fm. It's called Disco and it essentially does the same thing as Pandora: pick a band and it creates a play list including your selected band and other similar offerings. You can modify it once it starts playing too. It's pretty good and what's especially great about this is that you can use it even if you're outside the US, which can't be said of the other two services. Have at it:

YouTube: Disco