Check out this article about Vitamin D in the NYTimes. I’ve been writing about, & believe it is important that everyone have their Vitamin D levels checked, because so many people are deficient.
http://www.nytimes.com/2010/07/27/health/27brod.html?_r=1&src=me&ref=general
Dr. PEDRE's CLEAN LIVING 
I have been telling everyone about this and how you discovered I was deficient in Vitamin D. I have posted your links to my blog too. Thanks for posting this article – SO important for more people to know about this!! By the way, since taking the mega dosage of vitamin D, I feel SO much better, more energy, happier and less stressed out.