Everybody knows that leaving appliances on but now that many cell phones have switched to USB charging, it's easy to just leave your phone plugged into the computer and leave the computer on. While Apple provides a USB wall charger, it's pretty small and easy to lose. It's also easier to leave it connected to the computer you sync with. Furthermore, the wall charger often isn't compatible with the most protective cases. This makes using it annoying.
Energizer has developed an inductive charging technology which they call Qi. This technology uses a series of antennas and circuitry to send power across short distances without wires. It's a bit odd to think of, but it works.