The way it works:

Once you get over the amazingness that is the iPhone Remote app, there’s an additional step that involves the Airport Express card that makes this app that much more tasty and functional.  As you recall, the airport express comes with a toted feature called “Air Tunes,” which allows you to connect speakers to your airport express and wireless to play music from your iTunes on the computer.  This is all fine and dandy except that if your computer is in another room your options to change tracks are limited to, well, NADA!  So unless your Professor Charles friggin’ X, there really isn’t a solution to control music playback…

…Until now.  With the iPhone remote app, you can control your entire iTunes catalog with your phone, while enjoying the luxury of having quality speakers wirelessly streaming music from another room.  It’s a perfectly streamlined solution for having your iTunes collection in multiple rooms while maintaining control of playback and selection!