Research for the project has unturned a lot of hucksters. It feels like for every legitimate company I find selling a conversion kit or publishing information on the process, there are 10+ others with a snake oil solution. As is the case with most emerging technology, this is definitely a buyer beware endeavor.
Right now I’m feeling good about http://www.greasecar.com/. Their website is informative and it’s in English (apparently much of this technology originates from Europe and I loathe ordering parts from overseas).
http://www.greasyrider.com is an interesting documentary about so called greasecars featuring Morgan Freeman.
Also of interest is Willie Nelson’s site http://www.wnbiodiesel.com/. This site was recommended to me on several different occassion when the conversation turned to the veggieoil car.
Lastly, http://journeytoforever.org/ has LOADS of good information – tips, tricks, methods, etc. It’s a little much to take in all at once, but definitely a good reference.