Laelaps is the blog of 
The American Museum of Natural History Research Library has recently put up a website ("Picturing the Museum") containing hundreds of black & white photos of museum exhibits, dioramas, and behind the scenes prep. It is a treasure trove of photographic information; I just wish I could have seen some of these exhibits first hand! The behind the scenes photos are some of the most interesting, though, like this photo of the cleaning of an elephant skin;
Here are a few links to some other favorites, although I would encourage you to browse through them yourself!
[Hat-tip to Michael for letting me know about this]
Humanities & Social Science
