the ISU workshops used a great book written by Jon Van Gerpen, Gerhardt Knoethe, L. Davis Clements, Rudy Pruschko, and Brent Shanks. It's been put online by National Renewable Energy Laboratories (I think without explicit permission or something like that- if I understand correctly, an NREL grant was used in writing the book, but the authors thought that they'd be able to sell to to a publisher... but it was published online first with some of the author names missing, or something along those lines. I really hope I got this info right.). Anyway, ti's a great resource. Here are the three parts:
http://www.nrel.gov/docs/fy04osti/36244.pdf Biodiesel production Technology
http://www.nrel.gov/docs/fy04osti/36240.pdf Biodiesel Analytical Methods
the third one, Business Management for Biodiesel Producers, seems to be gone from the NREL site. It's been downloadable in the past. I'm not sure of the full story behind this.
Mark