Synergy

Synergy is a tiny Cocoa application for Mac OS X 10.2 (and later) that puts 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. Synergy can even automatically download and display the cover of the currently playing album. 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 access its Dock menu.