Sorry for sounding like a shill for this comment. as far as typing on silly surfaces, minnum has personally had my eye the most. tl;dr make the keyboard 1 dime

Sorry for sounding like a shill for this comment. as far as typing on silly surfaces, minnum has personally had my eye the most. tl;dr make the keyboard 1 dimension, and then use excessive prediction to correct the issues with that. combining that with a watch with a distance sensor (up along the arm), you then would have a keyboard and trackpad in the space of a watch. http://minuum.com/future-of-wearable-typing/ http://minuum.com/future-of-wearable-typing/ for explanation