Outdoor Jogging Route Mileage Counter This is a cool resource from Google that allows you to map out a jogging route and calculate the mileage (you know, the thing you used to have to take your car out and drive your jogging route to do?) Now you can do this from the comfort of your computer chair!
Search the USDA Nutrient Database This website gives you calorie and nutrition counts for nearly every food under the sun, and for any particular serving size you specify.
Calories Burned During Exercise This set of tables shows you the approximate number of calories burned for people of varying weights and for a particular type of exercise.
Nutrition Data on many foods, including Fast Food This website allows you to search most major fast food chains for nutrition data.