Music Harbinger is the easiest way to share what you’re listening on iTunes with all your friends, family and followers.
Share quickly to Twitter (Official Twitter.app integration), or Facebook, anywhere you want to. Just copy the Harbinger's text. There are two app interfaces to choose from: Status Bar or Floating Window that will follow you wherever you go.
Highly customizable and with the ability to automatically retrieve a GrooveShark link so you can share a preview of your music with your friends, family and followers.