Recently finished A Bone to Pick by Mark Bittman. It was more brief and less insightful than Omnivore's Dilemma but a worthwhile read that danced the line of informative without being priveledged. By the end, I felt it a bit redundant - eat more plants, eat less processed stuff - and can't say that I walked away truly feeling enlightened. That said, a few new things I learned:
GMOs aren't "unhealthy". The problem with GMOs lies more in their lack of crop diversification and not contributing towards sustainable agriculture.
Local is best - support your local farmer's markets, CSA initiatives etc.
Bittman makes many comparison's to junk food and tobacco. Just as the progress we've made there at once seemed impossible, it can be done with patience, commitment and personal change.
Choose better quality meat. Meat is a huge water and energy consumer, by eating less, and lowering demand, we improve our health and environmental friendliness.