Q&A: If we were to use hydrogen as fuel…?

In the non-racing sector, fuel cells are used to turn a fuel, like Hydrogen, into electricity via chemical reaction, not combustion. Hydrogen is not stored in them. There are now a few ways to store hydrogen; 1) as a liquid (needs very cold -422 degrees F temperature) or 2) compressed as a gas (as hydrogen is the lightest element, it leaks out of current compressed type storage tanks. I read a report that some company, I forget which one is working on a gas tank that will keep most of the hydrogen in storage longer than a week.
I also heard that ExxonMobil is working on an on-board hydrogen generator.
Researchers at the University of Bath have discovered that a compound of 6 rhodium atoms and 12 hydrogen atoms will store 2 extra hydrogen atoms at room temperature and normal atmospheric pressure. Apply an electric current and the extra atoms split off, ready to power a car {as of June 2007 report}.
Scientists from Oak Ridge National Lab and 2 universities are working on turning sugars known as polysaccharides into low cost hydrogen with the help of enzymes. Enzymes can break the mix of sugars and water into hydrogen and carbon dioxide. The scientists say a tank containing such a mix, with the right enzymes, could power a car for more than 300 miles.
Somewhere around 2002 a company called Energy Conversion Devices was working on storing hydrogen in solid pellets (metal hydride). A solid hydrogen storage system, and regenerative fuel cell was thought to allow a car to travel more than 200 miles with a one-minute charge at a service station. This technology would enable more hydrogen to be stored per liter (103 grams) of hydride than either gaseous (compressed at 5,000 psi provides 31 grams per liter) or liquid (71 grams per liter) hydrogen. Since about 2002, I haven’t heard a thing about them.
It doesn’t matter how hydrogen will be sold. I would think that for quite some time the service stations signs would say for sale at $ x.xx9 per gas gallon equivalent.