The Oregon Scientific Wireless Appliance Manager consists of two devices: a wireless transmitter that sits between an appliances plug and an outlet, and a display unit that then tells you just how much juice it's using.
The simple device comes in two flavors: the basic Wireless Appliance Manager, which handles one appliance, and the Advanced Wireless Appliance Manager, for the truly obsessive, which can handle up to 8 transmitters at once.
The single-appliance version will run you $60, while the fancy version will run you $80 (plus more for extra transmitters, one assumes). [Oregon Scientific]


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