I haven't really been keeping up with the fuel cell arena as much as the solar power world, but this article kind of peaks my interest. Genepax Co Ltd claims to have a fuel cell produce 300W based on feeding it water and it having a chemical reaction... well, that could be quite a handy generator :-)

Sounds a little of the "too good to be true" world, and it would depend on the cost of the other consumables (membranes, etc.), but who knows...

I know that fuel cells really work. Several of the major automakers have been looking at their use, and NASA uses them extensively on spacecraft.