A friend of mine sent me a link to liveplasma today. Liveplasma used to be called MusicPlasma and I have used that site some in the past to find new (to me) and interesting music. In short it is a search engine where you can enter the name of a band that you like and it will present you with a map (as displayed in the picture here) showing other bands that are more or less related musically. You can click on the other bands to put them in the middle and the map will update, showing bands related to that one and so on. The site also provides discography, you can listen to samples of their music (backed by amazon.com). And it also works for movies.