then I have you beat: PocketPC. Done.
Try to use it without looking at the screen. LCD touchscreens are great, in theory. To the HT noob they look much pretty and advanced than a ugly remote with couple of dozen buttons on them. They do have there advantages- you can add any button, place it where you like, and create graphics/logos. However in practise they're annoying. Imagine watching a film and you want to do something on the remote. You need to look down, so navigating on screen whilst looking at the TV itself is a chore. Plus if you press a button next to it accidentally might do something you don't want it to do.
I had a LCD touchscreen and learnt my mistake. A remote with majority of the buttons as "hard buttons" is much easier to use. Common transport controls which'll span multiple devices (cursor, menu, volume, play/pause stop/ffwd/rwind/forward/back should be hard buttons. With a smaller screen for custom buttons.