Unplug AC adapters when not actively charging electronics.
Even when your laptop or ipod is finished charging, the AC adapter is still using electricity. That's why the box is always warm. Although it is a small amount of electricity, it still costs you money. Doing this could also help lengthen the life of the adapter. So, when your electronic device has completely charged, unplug the cord from the wall. See...short, sweet, and simple.