Microsoft Hohm

Sign up now to be notified when Microsoft's new free online energy conservation service goes live.

From the website:

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.

For more information, read treehugger's informative post here.