Great! You know, I've got details on Microsoft's/Philips' "Infrared Keyboard" protocol, and I think it wouldn't be hard to implement. (I think that the LIRC guys are already using infrared keyboards and mice with their PCs.) But are these media players actually using infrared? I would have guessed that bluetooth is the wave of the future for this sort of application, and BlueMaemo should already be able to turn the N900 into a portable keyboard, I think...