Slow Food, Real Food
I just finished reading "The Omnivore's Dilemma" by Michael Pollan (thanks to Jennifer Vuillemot for lending it to me!). Before finishing this book, I also read his other book "In Defense of Food" and watched a documentary that he's featured in called "Food Inc.".
If you're concerned about the food you're eating, how its produced, how the animals are treated and how the land is used, these three are must read/views. If you're a farmer, an animal rights activist, vegetarian, an environmentalist, a worker for a factory farm or slaughterhouse, or just a regular person, these books and documentary will speak to you.
None of these are extremist propaganda in case you're worried. You'll come away with the tools you need to make informed choices about the food you eat...and to support the producers you trust and respect.