Nutrition facts for many common foods http://www.my-calorie-counter.com/Nutrition_Facts.asp
McDonald's Nutrition Facts http://nutrition.mcdonalds.com/nutritionexchange/nutrition_facts.html
Burger King Nutrition Facts (many links to click on here) http://www.bk.com/#menu=3,-1,-1
Taco Bell Nutrition Facts http://www.tacobell.com/nutrition/default.aspx
Chick-Fil-A Nutrition Facts (meal calculator) http://www.chick-fil-a.com/#calculator
Gatorade Sports Science Institute website - this is GREAT for the sports nutrition/athlete nerd in everyone! Gatorade Sports Science Institute
Use this to calculate how many calories you'll burn with various types of physical activity. Not perfect, but pretty reliable. http://exercise.about.com/cs/fitnesstools/l/blcalorieburn.htm
Livestrong.com's Daily Plate - a really comprehensive online food diary. For all we know, Lance Armstrong himself could be using this to get ready for the Tour de France! http://www.livestrong.com/thedailyplate/