I use a lot of the recipes in my Atkins for Life book (since they provide different menus based on the total carbs you want to eat), of course I use my Atkins Cookbook and AZ, I also use the Sugar Free Shelia recipes. I also regularly scavenge off of Jimmy Moore's site to get ideas.
I have several Dana Carpender cookbooks. I find her recipes to be hit or miss. Some are great and some are not. I think the 500 MORE low carb recipes is better than the original. She also has a low carb smoothie cookbook that I love. I use that one all the time. I like both George Stella cookbooks. And the Low Carb CookWorx book is good but the recipes are not quick or easy for the most part.