rolo, i'm sorry if i took anyone's comments out of context. true, biodiesel will be the first step along an incremental shift in fuels, but so will ethanol, and while that is happening you'd better believe the oil companies will be busy angling for their piece in the next wave. that WILL be hydrogen. of course, we ought to expect the feds to pass tough laws against 'making your own', as big money will need its monopoly protected.
from an investment standpoint i think it's prudent to have some assets at work in the "now", but also to put some cash to work in the future technologies. as explosive as growth in biofuels has been, getting into the right hydrogen tech now could make the savvy investor very wealthy.