Feet For Life http://www.feetforlife.org/ The website of the UK Society of Chiropodists and Podiatists. It has some useful general information on foot health.
Foot Health http://foothealth.com/ Information on foot health, includes Foot Talk, an online foot health reference book.
Foothealth http://www.apma.org/topics/health.htm This page by the American Podiatric Medical Association has some excellent online brochures on foot health and diseases that affect the feet.
Dr Stege's Foot Health Information http://www.stege.com/ Excellent articles on all aspects of foot health and disease.