if you really want to....
http://www.cbot.com/cbot/pub/page/0,3181,91,00.html
the CME and NYBOT list ethanol futures as well, but they don't do ANY volume. even at CBOT, a very illiquid contract.
perhaps the best bet would be to research some companies doing capital investment in ethanol production & buy a basket of the best-looking 5 or 6 you come up with.