The National Non-Food Crops Centre NNFCC
The NNFCC homepage provide links to external organisations relevant to non-food uses of crops; details of news and events relating to non-food crops and searchable databases on non-food crops, contacts and research. One of their most useful pages is the one on the sources, safety and viability of biodiesel

The National Energy Foundation on biomass
The National Energy Foundation, an independent UK educational charity, works in the areas of renewable energy and energy efficiency to increase the public. Here they provide a useful outline of the main types of biomass derived energy

BioMatNet evaluation of biofuels
Detailed evaluations on liquid biofuels: bioethanol and biodiesel and solid biofuels: energy coppice and fuel crops provided by BioMatNet, part of EPOBIO an EU project for realising the economic potential of sustainable resources.

EERE bioethanol biodiesel production description
US Department of Energy's Office of Energy Efficiency and Renewable Energy EERE Office of the BioMass Program description of bioethanol and biodiesel production