Biodiesel eXtension contains articles from professors explaining an exahustive list of biodiesel topics, from feedstocks, to production, to testing, to life cycle analysis.
This contains a biodiesel description from the official U.S. government source for fuel economy information.
This article from EIA (Energy Information Administration) summarizes biodiesel basics.
View the Biodiesel Fact Sheet from the EPA.
The National Biodiesel Board is the main lobbyist group in the United States for the use of biodiesel. Their website contains news, fact sheets, and a biodiesel emissions calculator.