I saw this on Kotaku this morning and now I must have this contraption. You basically replace your power outlet faceplates with these new ones that have a built-in USB port available on the side for charging. The port is powered by a metal lining that interacts with the screws that tighten the faceplate to the wall. Pretty clever. I want one for every outlet we have now.
http://gizmodo.com/genius-faceplate-puts-usb-ports-on-your-wall-with-no-wi-1693186539/+stephentotilo