Several fast food chains offer online charts where the nutritional components of various menu items are provided. This includes McDonald's, Jack in the Box, Burger King, KFC, Taco Bell, Arby's, Popeye's, Church's Chicken, A&W, Taco Cabana (pdf), Dairy Queen, Sonic (pdf), Subway, Quizno's, Wendy's.
These links are to the restaurant sites themselves. For a master site providing nutritional information for 372 different food places, nationwide, try DietFacts.Com.