http://mshohm.orcsweb.com/

Microsoft Hohm is a free online beta application that helps you save energy and money. With Microsoft Hohm you can better understand your home energy usage, get recommendations to conserve energy and start saving. As with any recommendation engine, Hohm will provide increasingly more accurate and relevant suggestions for energy conservation as its users contribute home energy input and feedback.

Bit of an odd URL. It does seem to be legit though.