United Nuclear is selling a Hydrogen Fuel System Kit that will allow you to convert your existing car to run on hydrogen. It's not for sale just yet, but they promise that they're "currently fleet-testing our systems and are in final preparation for sales to the general public." If they ever do manage to perfect this, I'd buy it. I'd love to never have to worry about going to a gas station again. But I have serious doubts that United Nuclear really does have a system like this nearly ready for sale to the public.

I've written about United Nuclear before, expressing doubts about whether they were really selling all the stuff they claim to sell. For instance, do they really sell super radioactive ore for the home hobbyist? Apparently United Nuclear was founded by Bob Lazar, who's known to be a bit of a crackpot scientist. He claims to have reverse engineered alien spacecrafts, for instance. This would seem to lower the company's credibility a little. (Wikipedia link via Gizmodo)