Since this thread has been dug back up, I feel the need to mention that while "Fryer to the Fuel Tank" is a good book about biodiesel basics, I no longer recommend it for people wanting to make their own fuel.
In recent years a lot of development has been done in the world of homebrew, and modern reactors are safer, easier to use, cheaper to make and produce higher quality fuel than tickell's. Also, some of his chemistry isn't the best, like his recommendation of 3.5g of lye per liter of oil. Research is showing that numbers between 4 and 5g per liter produces better conversion, making it less likely that you'll gel or emulsify your fuel during washing. Things have come a long way recently, and Tickell's work, pioneering as it was, is becoming obsolete in light of new research.
If anyone wants to get into biodiesel now, it may be worth checking out 'fryer to the fuel tank' from the library, just for some good background, but I recommend the book by Maria "Girl Mark" Alovert, available on her website:
http://www.localb100.com which is based on lots of experience, and good science.
Also, the forum:
http://biodiesel.infopop.cc is where a lot of great stuff is being discussed. The state of the art for homebrewing has come a long way, and that is the forum that most of it gets discussed on.
peace,
sam