well since no one answered i might as well give you at least one idea. how about a parabolic dish that transmits microwave energy to a remote control plane so it never has to run out of batteries?
or more mainstream might be a wireless ammeter that can be attached to the back side of wall outlets to let homeowners know if an outlet is using energy and also how many amps.
There are some IC from microchip that can help you do a project for a wireless system.
Get into the page to get this information, also there are some schematics, layouts and bom of material to build the receiver and transmiter
well since no one answered i might as well give you at least one idea. how about a parabolic dish that transmits microwave energy to a remote control plane so it never has to run out of batteries?