Music Marquee is a well-designed and easy-to-use social app for you music lovers. Listening to a great song and want to share? Music Marquee allows you to post to Facebook, Twitter, Last.fm, Tumblr, FriendFeed and Ping.fm. Last.fm allows scrobbling, and wherever supported Tasty Cocoa software has used token-based authentication instead of storing your password in the app. It's a simple app, but only $.99. There's a free, lite version if you're too cheap to drop a dollar on such things.