iTunes Sharing ... wirelessly is pretty neat

[kj4btkljv]

I'm just guessing here, but since the Airport Express is used to hook up "remote speakers", there's a couple of remote control devices that plug into it's USB port. These can be used to control iTunes (next track, volume up and down, etc.). Keyspan makes a remote that works with the Airport Express device.

http://www.keyspan.com/products/urm17a/homepage.spml

Jeff