Nice article from NYT on sunscreen and SPF: http://www.nytimes.com/2009/05/14/fashion/14SKIN.html
Also check out my blog on this topic: http://www.elizabethandersondermatology.com/Blog/ViewPost.aspx?id=153
Thanks for reading.
Elizabeth Anderson, MD
Staff Dermatologist, Elizabeth Anderson Dermatology
Knoxville, TN
www.elizabethandersondermatology.com