I think a lot of people get tired of posts asking “How many calories in __________” I think this should be a sticky.
http://www.nutritiondata.com/
http://www.calorieking.com/
http://www.nal.usda.gov/fnic/foodcomp/search/
http://www.fitday.com/
http://www.thecaloriecounter.com/
http://www.dietfacts.com/
Other useful links could be added over time.