] What nutrients are in your food? Find out in the Nutrient
] Data Lab's searchable database, which contains
] listings of over 6600 foods. Get accurate information
] about fats, carbohydrates and protein and learn what
] foods contain the most nutrients you're looking for.
 . . .
] USDA National Nutrient Database, Versions for Windows PC
] and Palm OS® Personal Digital Assistants (PDAs)
 . . .
] Contains free downloads of USDA National Nutrient
] Database for both Windows PC and Palm OS® personal
] digital assistants (PDAs). Allows users to search and
] display nutrient content of thousands of foods.

This database has an impressive variety of food. It doesn't have some of the more exotic combinations (like I can't type in just "sushi"), but it does have thousands of natural foods, and a good sampling of processed foods, from Big Macs to Hostess Ding Dongs to Kellogg's Corn Flakes. And for the foods it does have, it analyzes them *really* thoroughly. Not just fat/protein/carbohydrates, but every different type of vitamin, right down to the milligram of caffeine, or microgram of selenium, and a bunch of other nutrients I didn't recognize. All in a single package which I can download directly to my desktop or handheld. For free.

Every so often I find a resource from the government which is actually personally useful . . .

Nutrition.gov