USDA Nutrient Data
Online search for nutrients in food, or for food by nutrient (where to find which foods contain zinc, for example)
Safe Upper levels for Vitamins and Minerals, May 2003.
UK Government expert group publication.
Download Cron-o-Meter
Software application for tracking what you eat - free, open source, cross platform. Enter the kind and quantity of what you eat, see the analysis by nutritional content.
Micronutrient information from the Linus Pauling Institute
Peer reviewed research topics relevant to the premise that an optimum diet is the key to optimum health.