Windell writes in –
Here’s an article in EDN magazine titled “Power with no strings attached” discusses practical small-scale wireless power transmission. There are two really cool things in this article. First, a cutaway through the base of rechargeable electric toothbrush, showing the inductive coupler design. (How these things work has been discussed recently in the Make forums.) Secondly-wow- they built and show a wall clock that is *powered by* absorbing 2.45 GHz radiation. That’s the frequency used for 802.11b/g (and sometimes n).
Power with no strings attached – Link.