Calorie-counters and other health-conscious consumers have a variety of websites that provide data, rankings and other info on the calories and nutritional content of fast-food restaurant chains.
Here are two sites that I've recently stumbled on:
DietRiot.com has this page offering links to nutritional info for foods served at Applebee's, Subway, McDonald's, KFC, and others.
Health.com has ranked the "top 10 healthiest" fast food restaurants. Here is their list, starting with Panera (which happens to be one of my favorites).