Hydrogen is inferior, wasteful, and worthless. Should everybody decided that they want to drive hydrogen cars, the power that would require the production of hydrogen would be astronomical. Do some research, start by looking at this pretty diagram.

http://en.wikipedia.org/wiki/Image:Battery_EV_vs._Hydrogen_EV.png

And this is for Dirk with the "bashing Americans" comment, Americans suck, Japanese are smarter, more innovative, cleaner, and friendlier than Americans (and I'm American, I'd "move to Japan and eat rice" in a heartbeat if I could)