For the truly bored, a theremin-like device could be configured so that one hand's motion controls relative position within the alphabet (A-H, I-N, O-S, T-Z, or whatever) and the other selects a letter within that section. This input could then be sent to the computer, so said person could create fine literary masterpieces without ever actually touching anything.

EDIT: This might actually help with typing by people who for one reason or another are unable to use their hands. Elbows, feet, knees, all would work if properly set up.