BBC NEWS | Technology | Physics promises wireless power

BBC NEWS | Technology | Physics promises wireless power: "How wireless energy could work

The answer the team came up with was 'resonance', a phenomenon that causes an object to vibrate when energy of a certain frequency is applied."

I have seen this used on very small appliances, but it would be sweet to see this extended to bigger items. Still, it is unlikely that you'll be running your power tools or electric vacuum this way any time soon.