Still trying to figure out a way to take control of our home media server. I'm currently controlling streaming from my iMac to my stereo using TuneConnect (remote AppleEvent control of iMac) on my iBook and a separate complex kludge involving SlimServer, LAME, iTunes, Airport Express, and mp3 radio streaming (don't ask).
The Kensington remote works with the Airport Express, but it's IR. Doesn't work from the kitchen like the iBook with TuneConnect.
But then there's Sailing Clicker. The Bluetooth won't work (the iMac is out of range) but an 802.11b client that can handle WPA encryption could work. They support the Palm T/X. (Palm TX).
Sailing Clicker is $24 and the T/X is $300. A bit pricy since a Roku would do more and cost less. However both my wife and I have old SONY CLIEs. Either one could suffer a mysterious accident, and be replaced with the T/X ...
Update 11/2: Griffin has the AirClick.
Update 11/7: Griffin has just revised the AirClick. Also, Roku has now documented the 'Roku Control Protocol' which allows one to control a Roku device directly. This overall problem -- managing the relationships between music source, digital rights management, network bandwidth, user location, multi-display, locus of control, device integration, etc etc is really neat from a usability and design perspective. Frustrating (esp. the DRM part) but neat.