Ask Dr. Weil About this site: Andrew Weil, M.D., the best-selling author of "Natural Health, Natural Healing" and "8 Weeks to Optimum Health" offers a mix of self-promotion and real help to those interested in integrative medicine. His site features a personal vitamin advisor, natural recipes, and a place to post health questions. (http://www.drweil.com)   Pluses: Search on a term and you get a database of Q and A articles sorted by relevancy.   Minuses: The site, which makes extensive use of frames, is extremely difficult to navigate.   Best feature: The Herbal Medicine Chest shows what herbs are best for different seasons and offers rules for buying.

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