For fast food / restaurant nutrition info I like this site:

http://www.cyberdiet.com/ffq/

They have Canadian chains as well and you can choose which information you want, carbs, calories, fat etc., you can even do a search on items that are within a certain range.

McDonald's and Burger King's sites have the breakdown of nutritional info for each ingredient:

http://www.mcdonalds.com/countries/...down/index.html

http://www.burgerking.com/nutrition/nutrition01.htm