XTHN - Ethanol SM, I have keep this one on my watch list. Looks like a great entry point.
Ethanol is one of the next big alternate energy sources and US has ramped up its production to record levels. Major car manufactures have taken notice of the effectiveness and efficiency of this bio-fuel. Ford has already produced ethanol powered cars and trucks. The fact that this company has such a technological advantage in the production of the fuel makes it a great play.