Vitamin D researcher Dr. John Cannell is all over this one, so I don’t need to reinvent the wheel here. I’ll hit the highlights and link his articles for the full discussion. His 2007 article thank you, Jamie, still commenting and sending amazing articles and links from a disaster zone! may be familiar to some of you from the vitamin D council website, but he printed an updated article available on pubmed central in August of 2010 reviewing all the new research between 2007 and now. Hooray!
Thanks for the link Karen!