The current state of the automotive hydrogen industry
One notable statistic: There appear to be 100 hydrogen refueling stations around the world now, growing at a rate of about 30 to 40 per year. As point of reference, there are about 171,000 gasoline refueling stations in the U.S.
But as the history of gasoline-fueled vehicles shows, a lack of refueling stations is probably not the limiting factor for adoption of the technology -- even though gasoline stations came about as early as 1907, until the 1920s most gasoline was sold through other channels, and that didn't terribly hinder the adoption of the automobile...
In any case, it is an interesting report on the current state of the automotive hydrogen industry.