Aetna Intelihealth
Aetna: Inteli Health: Food Poisoning
Thorough overview of food poisoning. Includes information on symptoms, prevention, treatment, and much more.
Mayo Clinic
Mayo Clinic: Food Borne Illness
This site from MayoClinic.com provides great information on food-borne illness. The article is somewhat brief, but provides an excellent overview on the subject.