Phone chargers or any kind of charger left plugged in for a Blackberry, DS, phone....stuff like that. Unplug the charger when you aren't charging something. The charger draws power even if something is not plugged in. A small charger probably isn't taking up too much, but anything might help.
Most electronic devices do this, too. They draw power even when they aren't "on."
My simple solution to that is to have everything on surge protectors. Then, I can just switch that off or unplug it. Good to go!