In addition to Dr. Bernstein's plan, other experts, like Dr. Westman and Dr. Vernon, use similar carbohydrate restriction plans to manage blood sugar levels. The Nutrition and Metabolism Society has much information about diabetes and low carb diets. Search under each tab, there are many links to useful information here: http://www.nmsociety.org/index.html
The plan used in Dr. Westman's clinic is in the appendix of Why We Get Fat by Gary Taubes.