It's a fascinating subject.
If you go to the very top of the forum there, and click on the forum name, it takes you to a page that has many of the members listed along with pictures of there projects.
There is a fellow there named Bob Boyce, who is definitely one of the gurus of hydrogen generation. I suggest checking out all his past posts. There are other very knowledgeable folks there as well with some real experience under their belts.
Have fun, and be very careful as electrolysis will generally give you a hydroxy mix of hydrogen/oxygen which is extremely explosive stuff. You can start off with a very inexpensive small experimental unit and work your way up to a booster for a car, or whatever. It's all there.
j