You could completely remove the physical keyboard and go with something like:
http://www.portablegadgets.net/article/15/virtual-keyboard
Never used one of these personally, and to be honest I probably wouldn't like it as there is no tactile feedback (I used a mouse once (was technically broken so I can't link you to a product) with no physical click or sound, felt very awkward), but that doesn't stop these things being a pretty cool invention.