For a while I've been meaning to post my report card from 7th grade wood shop. That's the class where you learn how to use tools and build stuff -- we followed a series of steps to make a wooden locomotive.
Occupant behavior can make the difference between an efficient house and a wasteful one. Notorious energy hogs include plasma TVs, old refrigerators or freezers, ice-makers, and dehumidifiers. And don't overlook sneaky items like DVRs, always-on computer and entertainment equipment, etc.