The US Air Force is working to develop the coolest charger on the planet. The Remote Auxiliary Power System (via Gearlog) is a bat-hook like device that clips onto a power line and leeches juice, turning itself into a live outlet. Few details are out now, but the Air Force has confirmed that this thing will be rain safe.
That's especially impressive when you consider the fact that this Bat-siphon actually slices the power line just a little bit in order to make its connection. That right there is enough to ensure this thing will never be widely available on the civilian market.
Crooked Air Force scientists are more than welcome to send me one, though. Please?