cdnow.com used to have a nice little section where could search for a particular band and they would recommend other bands based on what you punched in. Liveplasma.com does just that and it makes it look all pretty and bubbly.
I keyed in a couple of my favorite bands. I was hoping to see some more results, but it’s still nice. You can click on a linked band and see what other bands/singers they are similiar to. That dynamic nature is pretty nice. The “maps” are animated too. You can also key in actors and movies to see what liveplasma thinks are similiar actors and movies.