I just watched Food, inc.
Participant media offers five ways to act now through their site takepart.com/foodinc. I particularly like how each issue has a "five ways to act now" section:
1.) Buy organic or sustainable food.
2.) Go without meat once a week.
3.) Read labels—know where your food comes from.
4.) Drink more water, fewer sugary beverages.
5.) Support companies that treat workers, animals, and the environment with respect.