It's far from a new concept, turning used cooking oil into vehicle fuel and may never be a large component of the renewable fuels industry, but it's still a really cool concept and Discovery Channel has a documentary which details the process. Co/Producer and Director Paul Lovelace was in the state at the Renewable Fuels Conference and joined The Big Show with more details:
It's a cool view and if you'd like to see the Documentary for yourself, check it out here.