The Metropolitan Museum of Art's new Open Access for Scholarly Content now provides free access to almost 400,000 high-resolution digital images of public domain artworks from their collection (FAQ). From a database searchable by artist name/culture, date/era, location, etc., works by El Greco, Picasso, Rembrandt, Titian, and many, many more are available to view and download.
The Metropolitan Museum of Art has many "educator resources" on Korean art, Islamic geometric design, African art, and more (i.e. books filled with beautifully reproduced images of art and artifacts, along with extensive background history). They are available for download as PDF files. [more inside]
Faking It: Manipulated Photography Before Photoshop is a new display coming to the Metropolitan Museum in New York. It features some fantastic historical photo
shops composites, multiple exposures, forced perspectives, and other clever camera trickery, and they've released a preview of some of the images they'll be hosting. [more inside]
The Met's Timeline of Art History. From Tibet to ancient Greece by way of Mesoamerica and musical instruments. An index by theme.