Some concerns about biofuel technology

Here is an article that I found about some criticisms on biofuel technology (and some possible concerns about the long term effects of bio fuel technology if it was implemented in the future): http://www.sfgate.com/cgi-bin/article.cgi?f=/c/a/2007/03/11/BAGDBOJ7U81.DTL
The article touches upon both the pros and cons of such a technology, and questions whether or not biofuel technology can end up being an enivornmental detriment (instead of being an environmentally friendly alternative to fossil fuels).