Leaving electronic items plugged into the wall drains energy even if they're not in use or fully charged. But it's easy to forget to plug and unplug an item -- like your cell phone charger. So look for energy-saving sockets like a Belkin Conserve Socket at the home improvement store. They plug into an outlet and have timers that automatically shut off the power to whatever it is you're charging. You'll save energy over time and the investment will pay for itself.