The app, which is currently available in "sneak peek" form for VIP subscribers of the service, helps you find, organize, and control music on your device. Search for songs you want to hear to add to your playlists, mix streaming songs with songs you already have, play songs immediately or queue them for later, even cache songs to play when you're offline. You can also use the app to create custom radio stations, similar to Pandora.
If you want to test out the service on your Android phone, you'll have to pay for it. To see how much, keep reading.
It will cost you $3 to become a VIP member of Grooveshark — but with this much functionality and freedom, it seems well worth the price. Grooveshark, come to iPhone, soon!