Excellent search engine for nutritional data.

This is the best online database I've found for food info. It has not only the basic foods, and nearly every item from the fast food chains, but also many exotic items from restaurants. Chef salad, miso soup, tuna sashimi, movie popcorn with and without butter... It's all here, and frequently with multiple listings from different sources, so it's possible to compare different sets of information.

CalorieKing Food Database