Sorry I haven't been around for a while, I'm trying to finish my thesis.
On a semi-related note, one of our chemical engineering faculty who focuses on biodiesel production (and other things) and I just had a review article published that focuses on the current state of biodiesel production technology, and ongoing research. See http://www.springerlink.com/content/6837rr026w91gg77/ if you're interested.
