There are several hydrogen powered prototypes running around, including one from Honda. However, it's a big leap to go from a hydrogen powered prototype to mass production versions of a vehicle, along with the necessary infrastructure to fuel them. If someone gave you a hydrogen powered car today, where would you fuel it? I live in a city of approximately 350,000 to 400,000 population. If there's anywhere in town to buy hydrogen, I can't find it in the yellow pages.

Honda is aware of the infrastructure problem and, according to the article I linked, is doing something about it:

But Honda is not just developing fuel cell vehicles. We are also taking leadership in the effort to develop a hydrogen fueling infrastructure. This includes a hydrogen station powered by advanced solar cells developed by Honda engineers. And a Home Energy Station that makes hydrogen from natural gas. These concepts represent an important means to reduce CO2 emissions.

This spring, we will begin research with this station and Honda's original stack FCX at our R&D facility in California. And we will conduct real world confirmation in cold climates in states on the East Coast. Through these original efforts, our goal is to contribute to the introduction of a hydrogen refueling infrastructure.

That's smart - they're designing a vehicle that will work in cold climates. It's all well and good to sell battery or fuel cell powered cars in warm places like California (that's a very big market), but there are a lot of places that get cold in the winter. I've heard that one of the problems with the GM Impact electric car was that it was basically a "California car" that didn't work well in the cold.