Hydrogen is still too far off to solve our energy problems. There aren't enough fueling stations, it takes energy to separate the hydrogen from the oxygen to get the fuel, the cars are far to expensive for the market, and the hydrogen isn't compressed enough for a car to go an acceptable distance on it.
Rather than invest in Hydrogen, we should focus on making the Plug-In hybrids that are coming out in 2010 from GM and Toyota more affordable. They get 150 mpg and all you need as a darn outlet. This is what the next generation of vehicles will be, not hydrogen. By the time we actually make hydrogen economical, we'll be driving electric cars.