water fuel

There is some interesting stuff on the Web about devices that use electrolysis to turn water into a hydrogen/oxygen mixture and burn it as a fuel enhancement for cars. Does anyone here have an opinion on how real this stuff is?

http://www.watertogas.com/?gclid=CJOyxIeQ0pICFSJ3lgod90MCIg

http://water4gas.com/2books.htm

http://video.google.com/videoplay?docid=660759158947266385