The hydrogen economy probably won't be on us for at least about 5 years if it paces itself at a break neck pace. The dream of having a farm with solar panels, converting water to hydrogen to store in tanks in the ground is a cool dream. You can then use that hydrogen to power your car or heat your home. The key is that the tanks haven't hit an economy of scale yet since the commercial hydrogen car just came out by Toyota this year. In the short run Hydrogen is expensive as all get out, but in the long run it can be cheaper than batteries. A battery array likely won't come down in price nearly as much as a pressurized tank will.
Get a farm, a solar array, some underground tanks, and you have unlimited fuel for your car and can heat your home in the winter for free. Gas stations will be something any Joe can make himself by installing a pump in his own personal system. The creation of the hydrogen gas is done on site with electricity and water.
That said, it will be a little while before we can all embrace it because economy of scale need to hit things like pressurized tanks and such. I'm interested in hearing about these other gases being made through solar energy though. I've heard other gases being used at powerplants and such, but I forget which ones.