The Atlantic does an interesting article in the March issue comparing, and taste-testing, local/organic products procured from Walmart and Whole Foods Market. Read it, it's an eye opener.
In slightly related news...this morning while walking through Walmart's produce section I overheard this remark from a mother to her 5-6 year old daughter: "No honey, mommy don't have enough money to get you no fruit." (the mother had a cart load of chips and cookies)
These two things make me sad.