Oh lord I have to have found one of the greatest apps for music on the mac EVAR!!!
Sofa is quite simply the best Itunes remote I have seen (quite a few that i tried are no longer supported). If you have a Mac and use Itunes (what else are you going to use) I would definately recommend checking it out.
If you are into Bjork in any way shape or form you should check it out (It took me a while but I got to listening to it eventually)