Another interesting article on the move towards wireless power, or what some are calling "WiTricity." I've written about this previously. The team at MIT is making some good headway. Check out the article for a diagram of how their wireless power beaming system works. It can power any device within about 9 feet.
Nikola Tesla was working on wireless power beaming in the early 1900's, but since that time nobody has really succeeded in replicating his work or taking it further. Wireless power is an important and necessary step in technological evolution that simply must happen. My guess is that it will be a commercial mainstream technology within 20 years, if not sooner.