I have been using bio fuels since 2001 and the befits are staggering: check these sites or just do a random search on the subject to find more info:

Posted by ricklbert
March 18/2009

Biodiesel Home Heating

Greasecar Vegetable Fuel Systems

Fuels: Japan: Biodiesel Fuel

Japan Biodiesel Initiative - BioDieselNow - Renewable biodiesel fuel