This model and another model they have -- the Flexi, which can actually roll up -- look as close as I'm going to get to a full-size keyboard that can actually sit on my lap and not be a complete encumbrance when I'm walking around.
I'm hoping to attempt to build a complete wearable computer interface -- eyepiece and full-size keyboard included -- during this year. This would be one of the first components that I've found that, almost off-the-shelf, will be what I need.
I'm actually hoping I can figure out a way to cut one in half, rewire it, and then keep each half on each half of my lap. (This would also facilitate keyboarding properly standing straight up, I think.) If it can't be split, then it'll have to pivot -- like, attach to a belt and roll up when not in use, that kind of thing.
Even barring all the wonky stuff I want to do with it, it just looks so damn cool anyway...!