ThinkGeek as been selling these for a few years now
[link] (If you're reading this, you're probably quoting me to tell me that it's an April Fool's prank)As cool as it sounds, it seems like you'd fry anything that was in between the source and receiver. It wouldn't even have to be a human, any insect or animal in the way would be exposed to a
ton of EM radiation.
It'd also be interesting to see what kind of effenciency this has. I would expect a large portion of the electricity needed gets lost in the transfer through the air, though these are still early prototypes.