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.

Kammen, the head of an energy laboratory at Berkeley, says cheap energy enables Western countries to live high on the hog.

Push can be a power hog because it requires your phone to constantly listen for new messages, so if you get a lot of email, there's a good chance your phone is using lots of energy.