We missed this one from CES.  RCA has made a charger that uses the Wifi energy all around you and charges a battery inside the device which in turn can charge your device.  The product actually works and was able t charge a Blackberry Bold from 30% charge to full in 90 minutes.  The charge time will vary depending on the Wifi and the signal strength around you.  Apparently this has been done before, but never efficiently enough to be worth our while.

Imagine if our iPhones had this technology built in and would charge wirelessly when we sleep just off our home Wifi signal.  The possibilities of this technology are endless when it comes to our power consumption.