Sony's Enzyme-Powered, Sugar Fueled Power Supply

Sony has apparently demonstrated a power supply for consumer electronics that uses enzymes to covert sugar to useful electrons (via Gizmodo).  Not many details are available (to non-Japanese speakers, anyway), but it looks like each "module" generates ~50 mW from an unspecified amount of sugar.  It is evidently just an engineering demonstration, but it's pretty cool nonetheless.  No word on how the digested sugar is converted to electrical power.