CNN health had an article on Vit D and the newest findings. Supports much of what we already knew.

Vitamin D is becoming an increasingly important player in a healthful diet. Over the past 10 years, a spate of research has linked it to an impressive and diverse array of potential benefits. In addition to vitamin D's well-known function of increasing calcium absorption and thereby helping encourage healthy bone growth, it has shown promise in helping to prevent certain cancers, heart disease, diabetes, and osteoarthritis.

http://www.cnn.com/2008/HEALTH/diet....n.d/index.html