It's hugely inefficient to transmit power wirelessly.
About 8 years ago I conceived a plan to harvest power from electromagnetic waves permeating a particular space (my house I guess). It looks like free power (but of course isn't). If you can have a wireless radio then you can use that same power to trickle charge a battery, multiply by the various frequencies with powerful signals, etc., etc.. [I'm sure many others here have had a similar idea].
On a very short range this has come out as a gadget in the form of wireless charging pads (eg http://www.powermat.com/) and reports are out of using the trick above to charge lower power devices over long distances (http://www.technologyreview.com/communications/22764/?a=f).
Haven't seen anything of this sort in the shops yet though. I suspect it might not be legal in my jurisdiction.