There’s a great new article from July 15, 2011 in Discovery News about plastics and BPA.
http://news.discovery.com/human/bpa-plastic-food-hormones-chemicals-110715.html
Eating Well had an article in the Sept / Oct 2011 edition.
Even when you buy foods packaged in plastic and the manufacturer claims it’s safe for the microwave, you have no way of knowing whether that plastic will have hormone disrupting effects.