Is this the answer that Airport Express owners have been waiting for? A USB powered remote control that can handle a variety of media apps, including iTunes. From the developer’s website:
When used with AirPort Express the Express Remote provides a powerful way to locally control music being streamed from iTunes on a remote PC or Mac.
It’s due to be released in November sometime. I think I’m gonna get one. Let’s just hope that it’s everything it seems to be.