I saw that this morning
Today's NYTimes:
Biofuels Deemed a Greenhouse Threat
http://www.nytimes.com/2008/02/08/science/earth/08wbiofuels.html?_r=1&oref=slogin
I've only had a chance to scan it, but I couldn't find much to disagree with.
One point that I struggled with is the assumption that crops will be grown on fields where forests used to exist. That's not necessarily the case.
Overall, I think ethanol catches a bad rap because of US corn ethanol. My understanding is that sugarcane ethanol (such as in Brazil) makes far more sense.
Either way, the whole biofuels debate has a lot more to do with interest groups and lobbyists than it has to do with the environment.