Wattson

 DIY Kyoto are the brains behind Wattson, the home energy meter. Its essentially an in your face, constant reminder of your energy consumption but in a slickly designed object. The technology is really well though out, you do not need to wire it into the mains and the box itself is wireless and can be moved, turned on its side/head and used as an ambient light. I would imagine gadget heads, environmentalists and kids would love it alike. And you can get involved if you want too, as they are running a competition to re-design the exterior casing. I will post my design soon.