A bit of seasonal humor, from the archives of The Toast: The Passive-Aggressive Guide to Book Gifting. As always, read the comments, too; The Toast is one of the few sites on the net where doing so adds value to the experience, rather than making the reader despair of humanity.
Also, a research source: The New York Public Library has put up a collection of digitized theatrical ephemera. That hyperlink goes to an article about the collection; the actual archive is here. They’ve got all sorts of stuff: programs, posters, correspondence, photos.