I came across this the other day and I thought it might interest you. It's called Kill-A-Watt and is from ThinkGeek Gadgets. The Kill-A-Watt allows you to connect your appliances and assess how efficient they are. A large LCD display counts consumption by the Kilowatt-hour, just like utility companies. You can figure out your electrical expenses by the hour, day, week, month, even an entire year. Monitor the quality of your power by displaying Voltage, Line Frequency, and Power Factor. It's pretty inexpensive at $25. You can then compare some of your older appliances against you new ones and see just how much electricity they are eating up.
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