You Control: Tunes is a free utility that gives you complete control over iTunes from the Mac OS X menu bar. You don't have to stop whatever it is you may be doing, switch to iTunes, take care of business and then go back to your original app. You can now simply pull down your very own custom menu that gives you access to the iTunes controls (Next, Previous, Volume, Play/Pause, Stop) as well as displaying the current track, artist and album. You can also navigate your entire iTunes music library from this menu as well so you never leave your current application.
Download You Control: Tunes