Script Summary: Adds Growl notifications and iTunes-style track info to the dock menu. Also adds the controls: Play/Pause, Next, and Previous. Works with the HTML5 version.
If you experience crashes when using the dock controls: This is a bug with how Fluid handles the adding and removing of dock menus. I think I've found a way to stop the crashes, and I hope to have an update out within the next day or so.
Update 3: Fixed some more bugs. Should fix problems with the dock menu being duplicated, and also shows the proper controls based on the song's position in the queue.
Update 2: Fixed some bugs. If you had problems with Growl and the dock menu not updating, this update should fix that.
Update 1: Now works with the new HTML5 version of Grooveshark. With this update, I was also able to add Play/Pause controls, which I wasn't able to do before (the old version would crash).
I recommend Tinylab's Grooveshark icon.