Bit of an old story, but got brought up in conversation andthought it deserved to be back in the public conscious. If you have never seen this before, you're in for a design-based orgasm.
Min Kyu Choi a Korean graduate from the Royal College of Art, designed this little piece of genius; a folding plug, which apart from the obvious travelling advantages, [Which in itself, merits its title of 'Brit Insurance Design of the Year'] it's the nifty multiplug adaptor and USB adaptor that elevates it to genius. I expect Min is going to make an absolute packet once it clears BSI regulations.
Check out the link for all the development work!