Everyone knows that their game consoles, appliances and HDTVs are energy vampires, and while Energy Star-certified products tell us which gadgets are more green-friendly than others, we still don't know just how much juice they're actually sucking down in a given day. Enter Sassor, a start-up from Japan that's created a system to monitor the electrical consumption of anything plugged into a wall outlet -- from PCs to refrigerators. It tracks power consumption using current sensors clamped onto power cords, which communicate wirelessly via
