Nutrition,
Diet, Foods 
Nutrition/Diet
American Dietetic Association
FDA Center for Food Safety and Applied Nutrition
Food and Nutrition Information Center -- From the National Agricultural Library
International Food Information Council -- A public policy group that researches and monitors food issues.
MEDLINE -- The NLM Gateway from the National Library of Medicine, provides references and abstracts from 4300 biomedical journals
Nutrition -- From the Librarians' Index to the Internet
Nutrient Data Laboratory -- From the U.S. Dept. of Agriculture
Nutrition.gov -- Nutrition and health information from government web sites
Nutrition Navigator -- From Tufts University
Quackwatch -- "Your guide to health fraud, quackery and intelligent decisions"
www.FoodSafety.gov -- Gateway to government food safety information
Specific Aspects
African Cookbook -- Menus, recipes, and customs from 10 African countries
Culinary History Timeline -- Excellent timeline covering "social history, manners, and menus"
Food Timeline -- Excellent timeline of food history and rich source of period recipes
Gernot Katzer's Spice Pages -- Detailed information on over 100 spices
The Global Gourmet -- Including foodwine.com and the electronic Gourmet Guide
History of Eating Utensils -- From the California Academy of Sciences
Recipes
African Cookbook -- Menus, recipes, and customs from 10 African countries
Allrecipes.com -- Extensive recipe site (each recipe includes nutritional information)
Epicurious -- Over 16,000 recipes, searchable by keyword as well as cuisine, low-fat, main ingredients, special occasion, etc.
Recipe Source-- Includes SOAR, the Searchable Online Archive of Recipes