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Let me tell you something here, folks. Electricity is expensive. I just got my latest bill and it's absurd. But now you can screw the electric company over and be a smarter consumer with Kill-A-Watt. Kill-A-Watt is an small device with an LCD for readout that goes in between your device's plug and the wall outlet that will measure how much electricity you're using. You can then total up how much it costs you to run a particular device such as that new gaming PC you built with the 1000W power supply. A great way to cut back on unnecessary use of electricity and lower your bills. It costs about $30 and is worth it if your electricity bills are exceedingly high.

Kill-A-Watt [Cool Tools]