Site for checking out your local laws and incentives for alternative fuels. 

http://www.eere.energy.gov/afdc/fuels/biodiesel_laws.html

Pretty good reading here:
http://www.nrel.gov/vehiclesandfuels/npbf/pdfs/40555.pdf


It is now my understanding that for the most part, as long as you pay the necessary taxes expected from you for your use of diesel fuel, you can make your own biodiesel.  Here is a link showing fuel tax for March '08.  Even if I had to pay the .27 state tax, and the .24 fed tax, that would still put me at 1.50-1.80 a gal.  I can handle that

http://www.eia.doe.gov/pub/oil_gas/petroleum/data_publications/petroleum_marketing_monthly/current/pdf/enote.pdf

Red,
A lot of the things I am reading are claiming that B100 reduces engine power and fuel economy up to 20%   You havent mentioned anything that extreme that I recall, just a small decrease.  Can you elaborate a bit?