Looking for a fun way to teach energy conservation to your kids? Check out the Power Hog, an adorably pig-shaped power monitor that introduces kids to energy efficiency (and general thriftiness) by piggybacking upon the familiar format of the piggy bank. You need to plop a coin in the Power-Piggy to activate electricity flow, so kids can use their allowance to turn on the TV or video games by feeding the Power-Hog with loose change. We know that any kid over age five will probably just unplug Mr. Piggy as soon as they figure out the hitch, but we still think its a lovely design concept nonetheless. The Power-Hog is one of our favorite finalists from the Greener Gadgets Design Competition, so if you like what you see here, check out more of the green gadget goodness on display (and vote for your favorites) at GreenerGadgets.com >