The following are some books and other tools that can help you get your blood sugar back into control.
For All People with Diabetes
Dr. Bernstein is most famous for his advocacy of a very low carb diet for blood sugar control, but the book covers a lot more than diet.
His advice on how to deal with hypos is the best I've seen anywhere.
His advice on how to use insulin is must reading for anyone with Type 2 whose doctor has given him or her a prescription and only the most rudimentary "education" in how to use insulin.
There's a lot here that explains why complications happen and why they don't
have to happen.
No matter how long you've had diabetes, I bet you will learn something worth knowing the first time you read this book.
Type 1 Diabetes
Don't let the title fool you, this book will extremely helpful to anyone dealing with a recent diagnosis of Type 1 Diabetes. I learned a couple very helpful things from it that applied to my own diabetes, even though it isn't Type 1. The author uses CMGS data to show you common patterns of blood sugar fluctuation that result in confusing readings and has many helpful ideas for how to deal with early morning hypos and much more.
I see this book recommended by people with Type 1 quite frequently.
This is another book that people with Type 1 diabetes frequently recommend to others.
Type 2 Diabetes
The book version of this web site. Highly recommended by Dr. Bernstein and other reviewers. Read their reviews
Here.
A gentle but comprehensive introduction to managing Type 2 diabetes with some very good ideas about how to use your blood sugar meter to figure out what you can eat.
Books to Help You Cut Back on Your Carbs
You'll find much more information in this book explaining how cutting back on carbohydrates affects your body and your health than you will in other more simplistic and hype-filled books like those of Atkins or
The South Beach Diet.
After you read this book, you'll understand more about how the carbs in your food affect you and what foods are more likely to give you normal blood sugars.
There's also good advice on what to eat when you are in restaurants and pages you can copy and use as a pocket guide to carb counting. Look for the cheap 1998 mass market paperback as it is all you need. They've published some expensive sequels that don't add anything really significant.
This is the cookbook most serious long-term low carbers recommend. Ms. Carpender originally self-published it before the "Low carb fad" of the early 2000s. The recipes, unlike those you will find in many other supposedly "low carb" recipe books are actually low in carbohydrates.
Readers of the alt.support.diabetes newsgroup are very familiar with Quentin Grady's informative essays about the little known nutritional treasures to be found in various vegetables, fruits, nuts, and other real foods.
Quentin has put his nutritional lore into an entertaining book written especially for people who would otherwise avoid reading ANYTHING about nutrition. Read this book and I guarantee you will never look at a vegetable the same way again.
AVOID Any Cookbook with the word "Diabetic" in the Title!
Sadly, the word "Diabetic" in a cook book title generally means "High carbohydrate/low fat recipes full of starch that will raise your blood sugars to scary levels, written by people who don't have diabetes." Most "diabetic" cookbooks feature a ton of pasta recipes because pasta will give you lovely blood sugar readings at 1 or 2 hours. Unfortunately, pasta may also give you extremely high blood sugar spikes at 4 of 5 hours after eating. But because nutritionists don't have diabetes and don't test their won blood sugar they don't know this.
Software to Help You Learn About What You Are Eating
The best way to learn about how much carbohydrate in your meals is to buy a food scale and then use software to learn what the actual carbohydrate count is in the foods you enjoy.
This is my favorite software for calculuating the nutritional values of what I'm eating. It is very easy to use and makes it also very easy to add your own recipes to its database.
It is shareware so you can download and use it for free for a month to see if you like it.
One really helpful feature of Lifeform is that it will convert cups to grams to ounces etc.
This is a free online service that many people use. It's a bit less well designed than LifeForm but the price is right.
I haven't used CalorieKing myself, but it has been recommended by people I trust. It too is shareware, and it runs on the Mac, Palm, and Pocket PC operating systems, too.
One Last Extremely Helpful Tool: The Food Scale
Diets and insulin only work properly when we understand exactly what it is that we are eating. Knowing that there are 29 grams of carbohydrate in one ounce of bread isn't helpful if you don't know how much bread that is.
That's where the food scale comes in helpful. Using it, you can get a much more accurate idea of what you are really eating. You'll learn portion sizes and that is often the key to making diets and insulin work properly.
The scale I like the best is this one: Escali Primo Digital Multifunctional Scale.
by Richard K. Bernstein
by Ragnar Hanas, Stuart Brink, Jeff Hitchcock
by Gary Scheiner, Barry Goldstein 
by John Walsh.
by Gretchen Becker
by Michael R. Eades, Mary Dan Eades
by Dana Carpender