This is, for me, one of the best examples of where the Web will take us. Not coincidentally it's reflective of one of my fave themes, the Long Tail. This site takes a couple of your favorite songs and creates an entire library of songs for you to listen to (and buy from iTunes if you find some new songs you really dig. Or digg, for that matter.)
You can check out my own personal radio station in the lower regions of the right-hand nav bar, if you feel like mellowing out to some great tunes (most of which I haven't even heard yet, but I like a lot of what Pandora's let out of the box so far).
If you're just discovering Pandora thanks to this post ... You can thank me later.