A large forum (Link has been misplaced) which deals with Health Issues
These are all opinions - but interesting
The following are vitamin D related charts as of Oct 2011
Above chart: Symptoms which people treat with vitamin D
Above chart: Ways that people get vitamin D - in order of popularity
Above chart: The forms of vitamin D which gave the most improvement
Above chart: Their opinion as to why they had a vitamin D deficiency
Above chart: Cause of Osteoprosis - Vitamin D is fairly low
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Above chart: SAD treatment - vitamin D and sunlight
Above chart: MS treatment - vitamin D
Above chart: Chronic Fatigue Syndrome - vitamin D is fairly low