when i was on an AI kick, I had a spider bot. started out using negative reinforcement to train it, but it would still find content i did not like. the key was to train it with positive reinforcement, and it ended up getting lost in good content. now i use that same technique for my diet.
instead of concentrating on the foods i cant have, i just think about all the good foods that i should eat. there are enough good foods, that i really dont miss the processed crap. so i really like the book The 150 Healthiest Foods on Earth along with the website whfoods.com. along the way, i've been having to learn how to cook. as Andy suggested, i turn to Alton Brown and Good Eats. i like his series because each episode generally concentrates on a single type of food. alot of times, i'll decide to try one of the healthiest foods from a source above, and then i'll see if there is a Good Eats episode dealing with it. of course i just skip the desert episodes. there really needs to be more 'healthy' cooking shows, something like these Cooking with Christina episodes on bodybuilding.com. speaking of bodybuilding.com, i started out reading there nutrition articles to figure out the macro-nutrient percentages i should be aiming for. it also has an endless supply of bodybuilder diets that i can attempt to figure out which one works best for my body type. so i've really had to relearn what food is. this has required alot of experimentation. so i make it a point to get at least 1 new food every time i go to the grocery store. this has helped me to rediscover alot of foods and find many new ones. there's been a couple times where i've taken an unlabeled veggie up to the grocery store checkout line ... and nobody even knew what it was (i.e. parsnips).
as far as organics, i saw the Penn & Teller Bullshit episode. so i dont really bother with organic veggies or fruits. i'll sometimes get organics just because the package might be smaller. otherwise, i might get the organic variety of a processed food. granted, i dont eat many processed foods to begin with ... but the organic variety generally wont contain unnecessary additives like high fructose corn syrup. about the only thing i regularly get that is organic, is organic decaf coffee beans.