Just caught the Oregon screening of the latest biodiesel documentary, Revolution Green. It's definitely worth a viewing and would be especially good for those who are new to the scene. The website is: http://www.revolutiongreen.com/.
There is a movement within the biodiesel industry to focus on sustainable production (or at the very least to move in that direction) and the documentary focuses on that movement and the people who were very important in its creation. Defining 'sustainable' can get a bit tricky, but it primarily has to do with localized production and distribution of a fuel, rather than one giant, centralized production area, which is pretty much the model we have now.