http://www.househacker.com/ househacker/tags/electrcity this article on CNN, the technology uses radio frequency and has a range of about 3 feet, making it suitable for charging mobile phones on desks or keeping wireless mice and keyboards charged. Thanks to the tiny receiver chip, electronics manufacturers can implement the technology into almost any device.

Powercast won CNET's Best in Show for Emerging Tech at the 2007 Consumer Electronic Show, and they describe the technology thusly:

While it's presented as wireless power, Powercast isn't just a replacement for a universal charger. Instead, it's meant to either continuously charge a battery or replace the need for them altogether.
It works like this: a transmitter can be placed anywhere--in a lamp, for example, that is plugged into the wall and sits on a table. The transmitter in the lamp sends out a continuous, low RF signal. Anything with either AA or AAA batteries set within its range--and equipped with a Powercast receiver, which is the size of your fingernail--will be continuously charged.

The first Powercast devices will be hitting the market in 2007, according to the Powercast website. ]]> http://www.househacker.com/permanent/Powercast-Wireless-Power-Transmission