There are lots of was to produce hydrogen, next trick is storing it safely. Salt Wwater Aluminum batteries happen to give off hydrogen while they are working (one use batteries though, then you must replace the aluminum) telephone company used to use them so I have learned. Lead Acid batteries also give off hydrogen gas, thats why a good battery pack ought to be vented properly unless they are sealed gel cells. Even water can give off Hydrogen and Oxygen. The process is called Electrolysis, just requires 2 stout electrodes and some electricity (not copper because it will end up electro plating the other side). A good choice for an electrode is platinum, even carbon rods are ok. Hydrogen comes out one side and Oxygen comes off the other.
This Fellow at http://www.scitoys.com/ has some interesting toys he shows you how to make in a educational style. If you look at his entry on fuel cells he will even show how to make an operational fuel cell. Very small scale though, and platinum is oftly expensive.
All that having been said, I do believe the future of energy storage is in hydrogen. If handled properly it can be safer than gasoline. Even Hydrogen combustion engines are a great deal more clean burning then gasoline. Hydrogen fuel cells could in the future take the place of batteries with a good Electrolysis setup to provide the Hydrogen off of Windturbines and solar panels you could use Fuel cells the way some people use backup Generators to keep the lights on. Coincidentally the Hindenburg's paint job had a similar chemical makeup to rocket fuel and it was the diesel that made it continue burning which is what caused the burns on the people there, not the hydrogen. The Hydrogen went up in just a few seconds, and it literally went up. When the balloon was punchured hydrogen went up and out while it burned up, thus carrying it away from the people, while the diesel which operated the turbines fell down on them and burned them.
