I'm very interested in hydrogen fuel cell technology as well. It burns clean producing water. However, there are many great challenges that hydrogen must overcome to be even somewhat viable. The biggest challenge is that even a small car (made extremely light) can only travel about 300 miles on a tank of hydrogen. In order to store enough hydrogen to even have this range capability, the pressure must be approximately 10,000 psi to keep the tank size feasible. 10,000 psi is a lot of pressure to have underneath you in an accident. Another obvious problem (it can be solved) is to establish the infastructure to fuel hydrogen cars. I personally believe that the government should mandate the sale of alternative fuels at gas stations (if the product is feasible), but were not there yet.
Does anyone know of any advancements in the hydrogen fuel cell development?