Here is a link to a Green Trust Sustainablility & Renewable Energy site. The site has some good information and products available.
http://www.green-trust.org/
I have a VW diesel and am in the process of building a biodiesel reactor to make my own biodiesel, which is an alternative to petroleum diesel formulated from clean or waste vegetable oil. Biodiesel can be used as a 100% fuel or mixed with petroleum diesel to power your diesel engine. Biodiesel can also be used as a home heating fuel. Be sure to check the compatability of your home heating system with biodiesel prior to using the fuel. Many local fuel oil companies are now carrying biodiesel under various names and percentage mixes. Your fuel company can let you know about the compatibility of your system to burn biodiesel.