My WOE is a lower carb exchange plan, I adapted from the hillbillyhousewife website.
http://www.hillbillyhousewife.com/
(the healthy eating tab, and then the dieting on a budget tab)
I basically took their higher protein 1200 calorie exchange plan and added 8 flexible exchanges (that I can use on milk, fruit, bread, or protein servings) and 3 more vegetable servings (optional).
I bought an exchange reference book (exchanges for all occasions) cheaply on amazon.com. I didn't even buy the most current edition (I bought the 3rd, edition), though I may buy the pocket-sized edition (the 4th edition) to carry in my purse (or maybe the book, The Official Pocket Guide to Diabetic Exchanges).
I also use online resources if the food isn't listed in my book, or if the computer is closer than my book, I just type in the food I'm wanting to look up and the words "diabetic" and "exchanges," (without the quotation markes)
into the google search box.
I love exchange plans, because they're flexible and make blanced eating "hard-wired" in. I need a lower carb plan for my insulin resistance (even too many fruit servings can trigger cravings and hunger), but if the insulin resistance is resolved, maybe I'll be able to include more carbohydrate-rich servings, without having to completely overhaul my diet. I can figure out the exchanges for almost anything, but it's easiest to eat whole foods (because they're easiest to calculate/count). It's like a built-in encouragement to eat more foods in their natural form.
Another plus in exchange plans, they're all pretty much modeled after the diabetic exchange plan, which hasn't changed much since it was developed in the 1950's. Or rather, the number/distributions of servings for each category
has changed over the years, and according to specific plans, but the exchanges themselves have remained the same. For example some plans may recommend more bread servings and fewer protein... which is why I like the hillbilly housewife site, which illustrates three different carbohydrate-level plans.
Because the exchanges haven't changed, most exchange-based cookbooks are virtually interchangeable. There are a few exceptions, but they're usually fairly easy to "translate," for example the in the DASH diet (developed to reverse high blood pressure) the exchanges are a bit different. Their protein exchange is equivalent to 3 protein or meat exchanges in other plans, and they've added another exchange for nuts (an ounce of nuts, I believe is 3 or 4 exchanges, in most of the other plans).
I collect cookbooks (usually from thrift stores and garage sales), so I pick up cookbooks with exchanges calculated whenever I see them (I just make a quick check, usually explained in the first chapter), to make sure the exchanges are similar. Some cookbooks I have or are on my wishlist on amazon are - any Weight Watcher's cookbook published before 1994, most diabetic cookbooks, DASH books, the Healthy Exchange cookbooks by Joanna Lund (although she relied heavily on name-brand processed foods), Richard Simmons' cookbooks....