Pa. Company Promises Wireless Power

I've ruminated about this many times before but never thought it would actually happen (so soon I guess?).

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.

Powercast must be built into new products instead of being an add on (currently) and so far only Phillips has signed on. I wonder if we'll ever be over saturated with RF signals? The spectrum already is so it would have to attempt to avoid interference from 802.11a,b,g,cordless phones etc. Many of the commenters pose similar concerns, but also mention the reduction of batteries in landfills. Clearly there are many possible benefits.
Link (via BoingBoing)