This month's Cooking Light has a good amount of information on organic products. Organic foods can be quite expensive, and while I try to buy many organic fruits and vegetables, I have always wanted to know what's really worth spending the extra money on. According to some research I have done, foods that come with the heaviest burden of hormones, additives and pesticides are most important to be purchased organically when available. Here is a list I've compiled that can be used as a quick reference guide when shopping:
These items are least likely to contain trace levels of pesticides.
Sources: April 2009 Cooking Light, thedailygreen.com