Found on the internet. "Energy and the Hydrogen Economy".  This is a very interesting document outlining the nature and costs of producing hydrogen using various techniques

http://www.eere.energy.gov/afdc/pdfs/hyd_economy_bossel_eliasson.pdf

Check the Wickipedia under Hydrogen Production for basic hydrogen info. and 
Wickipedia under Stirling Engines 

 New Fuel Cell System 'Generates Electricity with Only Water, Air'

Genepax Co Ltd explained the technologies used in its new fuel cell system "Water Energy System (WES)," which uses water as a fuel and does not emit CO₂.

The system can generate power just by supplying water and air to the fuel and air electrodes, respectively, the company said at the press conference, which took place June 12, 2008, at the Osaka Assembly Hall.

Prototyped vehicle	120W fuel cell system
Internal portion of the 120W fuel cell stack	300W generation system mounted in a luggage room (left)