Script Summary: Adds Growl notifications and iTunes-style track info to the dock menu. Also lets you pause or play from the dock menu.
In addition to showing track info in the dock menu, you can also click the menu items to show more info in a new window. You'll need to unblock popups in Fluid for this to work (Preferences > Security > Uncheck "Block Popup Windows").
I recommend rossr's Pandora icon.