http://www.househacker.com/ househacker/tags/meters Kill-a-Watt, the Watts-Up electricity monitor sits between the device whose energy you would like to track and a wall outlet. Both devices present you with a handy display of power comsumption, but the Watts-Up Pro (not the standard) has a USB interface, which allows you to download the stored data onto your PC for further analysis. The data can also be exported to Word or Excel. Conveniently, the Watts-Up displays the cost, in dollars and cents, on the unit's LCD screen.

See also:

Watts-Up and Kill-a-Watt at Amazon.com
The Gadgeteer's review of the Kill-a-Watt
]]> http://www.househacker.com/permanent/Watts-Up-Electricity-Consumption-Tracker Kill-A-Watt (heh) electricity meter. Plug in any piece of equipment and allow it to project the cost of running the device for up to a year. Until smart energy meters get a foothold in municipalities, devices like this will have to do.]]> http://www.househacker.com/permanent/KillaWatt-Energy-Consumption-Meter