The Kill-a-watt is an interesting tool. I’ve used them before, to check the actual power consumption of devices at work.

Oh, I can look at the power consumption and make a calculation, but it’s nice to be able to just plug something in and see in doillars and cents how much its costing you to run each month. Being a cheap bastard, and trying to get my utilities costs down to as close to nil as possible, I think this would be a handy thing to have around the house. The wallwarts alone in this house must cost twenty bucks a month to run.