> However, there's a guy in the US who can
> fill-up his table-top device with tap water,
> plug it into an existing power point and
> turn it on. Right before your eyes you see
> the water "smoke" as the hydrogen
> comes off of it.

Michael, here is a link I found which has the schematic for a device to generate hydrogen gas from water as you describe here. The URL is:
Beurger's Device

Check it out and let me know what you think.