In the "blog-o-sphere" a lot of heat, but not much light is generated in the "foodie space" talking passionately about these issues.  Here are several articles that have been posted on Marler Blog over the last year.  I hope they are helpful in a lighter debate.

Grass-Fed vs Grain-Fed Beef and the Holy Grail: A Literature Review

Pros and Cons of Commercial Irradiation of Fresh Iceberg Lettuce and Fresh Spinach: A Literature Review

Raw Milk Cons: Review of the Peer-Reviewed Literature

Raw Milk Pros: Review of the Peer-Reviewed Literature