Vitamin D latest finding- flu and colds

Here is my update of findings on Vitamin D and health.
Latest comes from Massachusetts General Hospital, on protective effect of Vitamin D against colds and flu. Study isn't perfect, and trials are needed, but finding out your Vitamin D status and making sure you're in the comfortable normal range (>40) makes sense in any case.
For background on how Vitamin D works, see Scientific American's great article.
For more sources on Vitamin D against auto-immune diseases and cancer, see my Jan 1, 2009 posting.