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Keyspan has a new version of their Digital Media Remote that will work specifically with Apple's Airport Express Wi-Fi/iTunes extender. By plugging the infrared receiver into the USB port of the Airport Express, users will be able to control not only iTunes, but other applications on their Mac or PC as well (I think—I'm a little iffy on the 'other than iTunes' part). It looks like the remote will be out in a few days for around $60. For those that use the Airport Express as a way to get their computer's music to a stereo in another room, it would almost certainly be a worthwhile purchase (presuming you haven't already worked out another way to control your computer via Bluetooth or remote)."
One of the biggest reasons I have not bought the Airport Express is that there is no remote control. Here was have an expensive solution for those who already have bought one, but at $60 I think I'm going to wait...