Investing in biofuels stocks isn’t a slam-dunk. Ethanol-related stocks got a huge boost in early 2008 after the EISA was passed, but by the middle of that year, criticisms of the effect of ethanol on the price of food supplies reached a crescendo, and the market turmoil added to the pressure on biofuels producers. Some that had been seen as good bets, like #2 ethanol producer VeraSun, went under and saw its assets sold off at a fraction of their value to refiners like Valero (VLO). Yet lately, we’re seeing increasing strength in the shares of the surviving ethanol-related...