As a starving student who can't afford a hybrid, I've long fantasized about buying an old Mercedes and jumping on the biofuel bandwagon. Those devastating images from the British Petroleum oil spill have only increased my sense of urgency. And, I'm not alone.
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(The success of the biodiesel fuel industry relies heavily on biodiesel testing <http://www.youtube.com/watch?v=s32Ke2VzrqU>, not only at the production level but at the consumer level, where degraded fuel may cause engine failures.  Of major concern to diesel and biodiesel users is the very real possibility that water has contaminated their fuel. (See http://www.youtube.com/watch?v=0YcczdvPyAk).  The potential catastrophic impact of this problem is discussed at length  in this video at: http://www.youtube.com/watch?v=-lh4qhXc_5s&feature=youtube_gdata.
Fleet Fuel's  family of inexpensive biodiesel test kits  is just a click away on the internet at:
<http://fleetbiodiesel.com/biodiesel_testing_and_supplies.html>)