y42 writes,
Researchers at the ETH Chair for Power Electronics have developed a matchbox-sized, 100 watts electrical generator, with an efficiency of close to 95 percent.

These ultra small gas turbines have a range of potential applications, from energy supply for portable heart-lung machines or artificial hearts to turbo compressors, which condense gas mixtures or air. This isn’t the kind of thing we normally report on, but it’s a heck of an acheivment, and (as y42 pointed out) can go a long way if you plan to build your own Iron Man armour.