National Biodiesel Board
A great resource for all sorts of information about biodiesel both technical and educational created by the national trade organization for biodiesel.

BQ-9000
The site provides information about accredited producers and marketers who have implemented an extensive program to ensure the quality of their fuel.

Sustainable Biodiesel Alliance
Information about environmentally conscious community based biodiesel production and use.

Biodiesel Coalition of Texas
State organization supporting biodiesel

Alternative Energy News
Great site relating to all aspects of alternative energy