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"We heard some pretty far-fetched stuff back in June to the tune of a break-apart DualShock 3, and lo and behold, it seems that someone at Sony Computer Entertainment America is taking the idea quite seriously. A recent patent application was filed by the company, and it fairly clearly lays out the very kind of design we'd (not really) been expecting. In essence, the gamepad would consist of two pieces, each of which would utilize an \"ultrasonic tracking system\" for some type of game console / peripheral to recognize 3D inputs. Best of all, the approach here sounds significantly different enough from what's used in the Wiimote that Sony could avoid months upon months of litigation -- imagine that, right? It's hard to say whether this stroke of genius will ever amount to anything, but at least there's a chance, however minuscule.[Via PS3 Fanboy]"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.engadget.com/2008/10/31/sony-patent-app-details-motion-sensing-break-apart-controller/>