H2 stored in a metal hydride can be instantly converted back into gaseous h2, just add water. http://www.powerball.net/ has some info if you are interested.
I believe using a metal hydride "gas tank" would be pretty heavy and I don't know how many miles worth of fuel you could carry. I'll take a look at the link you provided.
Also, that would still require someone to fill the car with gaseous hydrogen and also the infrastructure to deliver across the entire country/world. There is already the infrastructure to deliver gasoline and/or methanol.