Only problem is that Hydrogen is not an energy source. It is merely an energy storage medium. Unless you plan to take a trip to the sun/outer planets to get some, you cann't find elemental hydrogen in nature. There are plenty of ways of storing energy produced, but what we need is a way to produce it clean and cheap.

All the government funded R&D on a hydrogen powered car is a huge waste of time and resources. The hybrids being produced are making money while developing the same technologies without government subsidy and saving energy now! Hydrogen as an energy storage medium is pretty lousy. It requires great pressure or exotic compounds and still does not contain the energy density of hydrocarbon fuels.

RE: RAND Forum on Hydrogen Technology and Policy