JC, I'm with you on this. Dr. Mercola has written alot on the importance of optimal exposure to sunlght in preventing cancer, not just melanoma but other cancers, by producing Vitamin D in the skin. There are a lot of interesting facts about this on his website, including some research by a Dr. John Cannell, showing that low Vitamin D may explain about 30% of all cancers annually. He is not advocating excessive sun exposure, but brief and frequent sun exposure, since you make all the Vitamin D you need very quickly, like in an hour a day:
http://articles.mercola.com/sites/articles/archive/2009/01/22/facts-you-need-to-know-about-sunlight-and-skin-cancer.aspx