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There is already an application that "broadcasts power." The RF property tags on many high value items in stores receives a power signal from the access device (those weird looking things as you leave most stores), takes the energy and broadcasts an id back to the access device, and the device will then sound an alarm if the item has not been "cleared." Recently there has been a lot of talk about putting human ID chips in people's bodies. About the size of a grain of rice the devices would respond to a near by power source and report a serial number which could then be looked up to identify the person. Like devices are also used to identify ownership of quilts, art work, and clothing.
As for the Sony Reader lasting 10 years, I still have some 20+ year old DOS programs that are still in use. If I get 10 years of use from the reader then it was very much over engineered.
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