I had the pleasure to read "The Humane Interface" of the late Jeff Raskin over the christmas break.
Raskin very much focusses on techniques to make a touch-typing, text-processing power-user more efficient using the computer. While these techniques are definitely worth pondering, I was hoping for some insight on how to make the casual, non-touch-typing, non-power-user more efficient in using the computer to accomplish a task. That's a much harder task than improving a power-users efficiency.