I was watching some videos on youtube about hydrogen production, and it seemed that the "V" arrangement seemed to have a remarkable amount of production ( John Aarons videos see widow maker )

Another thing that stuck me was the electrolyte, the new thing is to use distilled vinegar. It seems to me this would be far less dangerous then the some of the other electrolytes.

I have also looked at making hydrogen with Aluminum combined with lye. This seems very dangerous but the production is awesome. I have found a video of this method on both Youtube and AOL online

Plans to use aluminum to make hydrogen.
Build your own hydrogen generator plans

Sirhoax on Youtube has a cell that he has made from Lowes stainless steel light plates using a computer power supply. I thought this was a very clever means of hydrogen production.