Marginally ergonomic issue, but in the "optimization via computer peripherals" bucket Twiddler keyboard looks interesting http://handykey.com/specs.html. For one you can type in bed without need for a table, but also good potential input for wearable computers that are around the corner. See http://www.youtube.com/watch?v=_V2i_7oX8mw (I think this guy is working on http://9to5google.com/2011/12/19/google-xs-wearable-technology-isnt-an-ipod-nano-but-rather-a-heads-up-display-glasses/)