Fujitsu has an interesting power strip for those who give a hoot about their electricity usage. It measures the electrical energy used in each outlet in real time, to help figure out how much electricity is being used in an office.
This data is combined with a scheduler to let you know how much energy is consumed even in the absence of the user. Each outlet has a contactless power sensor that can measure up to 2,000W. The data is transmitted over the network via a transmitter in a USB port on the side of the power strip.