It's alot easier to just use WVO. I think bio is alot more complicated and isn't worth the time. But, you be the judge. Here are some sites.

http://www.greasel.com/index.html

http://www.greasecar.com/forum.cfm

http://biodiesel.infopop.cc/eve/ubb.x

http://www.frybrid.com/forum/

http://www.greasemachine.com/forum/

http://www.localb100.com/cbt/mainpage/

That's probubly enough reading for the next 2 weeks.
Let us know what ya think!