If you're looking for some new tunes, Music Artist Cloud creates recommendation clouds of new artists based on the music you already enjoy.
Plug an artist or group into Music Artist Cloud and it spits back a cloud of names weighted by relation to your search. Clicking on any of the tags in the clouds generate a new cloud based off that new selection. There's a side bar of artists and groups most similar to the one you search for, and beneath the cloud there are YouTube videos of the artist you're currently viewing. it's a good spot to do some exploring, but for other interesting recommendations, check out We Are Hunted and Wired's guide to find new music on Twitter.