A killer application for selling to me:

A chording keyboard and ssh (I use Emacs anyway). This needs a good battery and enough screen quality for readable 80+ character without headaches.

Then I could go walking with a backpack filled with coffee and lunch... It might be hard to combine a readable screen with a not too high risk for getting my hit by cars.

(Possibly two chording keyboards if they leave the hands usable when strapped on?)