[Update -- Buzz has been retired in favor of Music Buzz, which is the same app, but free!]
Check out Buzz for Windows Phone 7. Find the buzz about the bands you love. You'll be amazed at the latest news, blogs, videos and music (remixes, bootlegs and more) that the Buzz application will find. 99 cents but it is worth it. Found stuff I wouldn’t have otherwise.
Here’s some screenshots: