It's not big here but it's huge in europe where the majority of your vehicles are diesel powered. As far as the vegi oil conversion you may have heard a lot of buzz about "bio-diesel"...they are the same thing. A diesel motor will actually run on vegetable oil with out making any modifications. The problems comes with it gets cold and the oil solidifies in the fule lines, pump, tank etc. So, the put the oil through a process that removes the glycerine from it so that it will not go solid.
The problem with hydrogen thus far is that it take more energy to get the hydrogen out of the water than the hydrogen puts out.
Oh, and a lot of you need to be wearing foil hats to keep the satelites and black helicopters from controling your thoughts.