Though not a regular Oprah follower, but I really enjoyed her show yesterday highlighting Eric Schlosser's documentary Food, Inc. Eric is the guy who was behind the book "Fast Food Nation."
I had previously caught the whole movie on Netflix (documentary fiend)
Not to say I buy all organic now, but I try to make better choices where I can.
Anyway, if you're at all interested in where your food comes from (what's fed to cows, how chickens are raised, why fruits available in supermarkets all year long even out of season, etc), it's a movie worth catching - check netflix if you use them.
Also, for those who are interested, Oprah/Amazon worked out a deal to offer the movie for $9.99 with free digital download (deal was supposed to end at midnight but still appears to be active). I actually bought a copy to loan to friends/family.