http://www.biodieselcommunity.org/mainpage/ is a complete resource for all you need to know about homebrewing biodiesel.
Biodiesel suppliers are also listed but here are the better ones in a nut shell:
1)
http://www.utahbiodieselsupply.com/
2)
http://www.b100supply.com/
Keep it in the "family", IMO, is the best way to promote our hobby. The Collaborative Biodiesel Tutorial also has a page with a calculator on it so you can use that also to help check your testing results.
Happy brewing.
