Synergy 6.0 beta

Synergy places three buttons to control iTunes in your menubar: previous track, next track, and play/pause; as well as providing you with visual feedback about the currently playing tune.
The Synergy controls, together with the ability to control iTunes via system-wide Hot Key combinations, mean that Synergy provides the fastest way of skipping between songs when using the keyboard or the mouse; all this without having to switch to iTunes or accessing its Dock menu.