You can use the Grooveshark.com Javascript API to control the user's queue and perform song-related user actions.
Once the user is on Grooveshark.com, the window.Grooveshark object will be available via Javascript. You can use a bookmarklet or extension/addon to inject JS into the page and use the methods available.
Want to have your app included in our official Features section? Contact us at developers@grooveshark.com.
