A recent study by Stanford University researchers concurs with the case I make in my forthcoming book, The Food Police, that there is no systematic difference in the nutritional content between organic and non-organic foods.
The study has caused quite a stir among many organic food advocates who cannot seem to acknowledge the science on the subject.
Now, that doesn't mean that there aren't some advantages to organic; however, as I've argued, the advantages are often over-hyped and the costs often downplaced. If you have questions about organic, this Q&A piece in the NYT just about nails it.