Over at the Brookston Beer Bulletin, Jay Brooks flags an important report that just came out from the government called "Dietary Guidelines for Americans." (Readers from elsewhere, sorry--you'll have to find your own government report.) I don't want to just steal Jay's thunder, so go over there and read the pieces he highlighted. The upshot is that moderate drinking is associated with positive health outcomes, and also, what constitutes "moderate" is pretty liberal.
For serious wonks who want an even fuller picture of the available data, go read the section of the report on alcohol (.pdf). It is pretty amazing how uniformly modest drinking has positive benefits over non-drinking. Heavy or binge drinking is, unsurprisingly, bad for you. Children and lactating mothers should, unsurprisingly, not drink.