Body Mass Index Calculator (BMI):

http://www.nhlbisupport.com/bmi/

BMI table:

http://www.nhlbi.nih.gov/guidelines/obesity/bmi_tbl.htm

Healthy Recipes (make sure the ones you choose are easy and inexpensive enough for your taste):

http://www.nhlbi.nih.gov/health/public/heart/obesity/lose_wt/recipes.htm

Helpful Guidelines for Controlling Your Weight (follow only those consistent with long-term success):

http://www.nhlbi.nih.gov/health/public/heart/obesity/lose_wt/control.htm

Calories Found in Foods and Burned by Exercise:

http://caloriecount.about.com/