From the Heart & Stroke Foundation:

Strategies for a healthy weight
Take small steps, aim modestly and realistically, and then build from there.

Healthy waist
Fat stored around your middle can put you at risk for high blood pressure, high blood cholesterol, type 2 diabetes, heart disease and stroke. And where you carry your weight is just as important as how much weight you carry.

A practical guide to weight management
This booklet will help you find strategies to keep the weight off for good. Winning the battle of the bulge for the long term means finding an eating and exercise plan you can live with forever — one that satisfies your nutritional needs and provides the energy you need for active living, while pleasing your palate.

From the Diabetes Association:

Healthy lifestyle resource
This manual contains information on a wide variety of topics. Topics covered include weight management, body image, and problem solving.

Sweet choices
Are you worried about the calories in sweeteners like sugar and honey? Are sugar substitutes a better way to sweeten foods without the extra calories? Let's consider the sweet choices available to people with diabetes, and how they fit as part of a healthy diet.

From HealthyOntario.com:

Reality check
Do you really need to lose weight? Obesity is epidemic in our society, and it can have serious health problems. But unnaturally thin body ideals are a problem too. Where do you fit in?.

Do fad diets work?
If you're worried about your weight, you may be looking for a quick way to shed the pounds. But perhaps you should be thinking about longer-term, more gradual ways to modify your eating habits.

Fad vs. Fat
You've read about them...You've seen the testimonials...You probably have friends who've lost a few pounds on them. Why shouldn't you try one of the popular, new diet programs?

Low Carb Diets
Whether we're talking about Atkins or South Beach, this is one type of fad that never seems to die. But there are strategies for successful weight loss that will be more beneficial to your health in the long run.

Weight gain increases breast cancer risk
Women who gain weight any time after the age of 18 are more likely to develop breast cancer than women who maintain a stable weight, a new study reports.

Eating for two - weight gain during pregnancy
What and how you eat during pregnancy will influence the health of your baby. Choose wisely.

Child obesity
On weekends and after school your kids have more time than ever to watch their favourite tv shows and play their favourite video games. But could these sedentary hobbies be putting your child at risk for developing obesity?

Other useful sites:

Body mass index calculator
Most people know that their weight has a strong effect on their health. But not everyone has a clear picture of what is an appropriate weight for them. Enter your weight and height and the calculator will do the rest.

Body mass index calculator for children and teens
The body mass index for children and teens varies depending on your child's sex and age. In addition to the calculator, this site has links explaining the different results.

EATracker
The Eating and Activity Tracker lets you track your food and activity choices and compares them to the guidelines laid out by Health Canada. It assesses your food choices and provides personalized feedback on your total intake of energy (calories) and essential nutrients and compares this to what is recommended for your age, gender, and activity level.

The safe use of products for weight loss
An increasing number of Canadians are using health products for weight loss, including prescription drugs and natural health products (NHPs). These products may provide benefits when used properly as part of a weight management program. However, misuse of these products can pose serious risks to your health.

How to lose weight without going on a diet
To achieve real, sustainable weight loss we need long-term healthy eating patterns that we can enjoy and maintain. This fact sheet offers plenty of strategies, tips, and weight wisdom to support you in your weight loss efforts.

Overweight teens: what to do
Provides general information about average growth and weight patterns in teens. Offers advice to parents with an overweight teen.

Top 10 healthy weight tips
Compiled by Dietitians of Canada.

Easy weight-loss tips
Here's a collection of our top weight loss tips. These pointers will help you with everything from portion control, to cutting fat, to dressing slimmer! From your About.com Guide to Weight Loss.

Keep a food diary
Use this page to record what you eat and when.