Ever wonder how much it costs to run your big-screen LCD? Kill-A-Watt EZ tells you how much electricity you're burning. Connect your set (or any appliance, really) and EZ will tell you the burn speed in kilowatt-hours (just like your utility does).

Based on your electric bill, you can calculate your expense by day, week, or whatever. Additionally you can see the quality of power by checking the voltage, line frequency, and even the power factor. A good way to see if it's time to scrap the old air conditioner or fridge. Finally you know watts killing you. — Ken Sander