Wireless power remains one of the Holy Grails of electronics; even with wireless video and audio solutions in the market, there's still a power requirement that demands at least one cable.
It's the reason that wireless surround speakers can't easily be mounted anywhere; you still have to run power to each one.
Source:
http://hothardware.com/News/MIT-Working-On-Wireless-Power-CordFree-HDTVs-Within-Sight
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