Marketplace
This is an excellent App. I have been using the free version for ever, but at this price, it's worth supporting the developer and getting yourself a full copy. Very useful.
From their site, http://www.yellowmug.com/sk4it/
Control iTunes without leaving your current app. From play/pause to switching playlist or searching your iTunes library, SizzlingKeys lets you do all that and much more.
See what's playing. Why bring up iTunes just to see what's playing? SizzlingKeys features a floating window that shows you the current track info. Place it anywhere you wish on the screen by simply dragging it.
Easy setup. Having all the features you can imagine is useless if the app is difficult and confusing to use. That's why we make ease-of-use our top priority. Customizing SizzlingKeys cannot be easier.
Extras. SizzlingKeys is more than an iTunes controller. We figure since you are going to have a hot key app running in the background anyway, why not let it handle a few more functions? SizzlingKeys lets you optionally define hot keys for system functions like Sleep and Fast User Switching.