There is simply not enough platinum around to support the use of fuel cells in any sort of large amount of cars. It is a basic supply problem. They simply have to get it down to about twice or better than catalytic converters for it to work.At the same time, there is the other alternatives, which look much better, battery powered electrics, and the Volt. And the possibility of ultracaps. Personally I think the concept of the Volt is by far the best in between solution. It allows leverage of the Grid, and renewables that are starting to go into the grid (here in the PNW, we have tons of renewable energy), and occasional longer distance. The technologies in the Volt well eventually be placed into other vehicles.Batteries will then likely become the local solution for cars that never go too far from home, but I can see tons of people getting stuck on the side of the road for HOURS because they went too far between charges. (I suppose this will be good for the towing agencies).And finally Fuel Cells, because the will be cheap enough to build and create an infrastructure for. I hope that they can learn to make fuel cells cheap, cuz I want one for my home. It would be cool if I could plug my fuel cell into my home circuit to live off the electricity my car generates.