I found this document, published by the US Department of Energy, Energy Efficiency and Renewable Energy department. It's a really good overview of biodiesel storage, temperature considerations, blending, different names and acronyms, chemical makeup, etc. Everyone who uses biodiesel should read this; it's a great resource for the beginner as well as the mostly-clueful.
Biomass Biodiesel Handling and Use Guidelines
DOE/GO-102006-2288
Second Edition
K.S. Tyson and R.L. McCormick
National Renewable Energy Laboratory (NREL)
March, 2006
68 pages
I opened this PDF a week or two ago, but completely forgot what site I got it from. I tried finding the "right" link on-line to an NREL page, but the @#%@#% search engine at the various DOE websites was totally worthless. They had a 2004 edition (not the 2006 edition I saved) and I have better things to do with my time, so I just saved my own copy here:
http://www.loligo.com/lister/biodiesel/BioUseHnd.pdfJT