Right now, I'm entertained -- and pleased -- by Google's energy-saving tips campaign:
"Haunted by high energy costs? Here are some easy ways to save."
Their "Haunted House" takes you through what to do if you are "haunted" by different things ("Ghosts: Hear that eerie moan? That's the sound of warm air escaping up your chimney. Close the flue damper when the fireplace isn't in use"). It's both cute and practical. And their calculator will help you determine both how much money and how much energy you save by the actions you're already taking. Plus, they have an advanced tips section.