Well, after some two and a half years, Choi's design (with some modifications) is finally making it onto the market, at least for certain values of "making it" and "market". Known as The Mu, the plug will be available as a folding USB charger, which will be sold for £25 at the Design Museum in London (i.e., this is currently for design enthusiasts only). As for being able to charge your ultra-light laptop with a plug that doesn't look anachronistic next to it, that's still some way off.
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