In the spring of 2007, the Yale University Library began a project to digitize the holdings of Yale's Visual Resources Collection (formerly known as "Slides & Photographs"). Just this week the library announced that over 200,000 images have now been added to the collection. Check it out here.
All of these images are also being added to ARTstor. ARTstor is a database of almost 500,000 images of architecture, painting, sculpture, photography, decorative arts, design and many other forms of visual materials.
Questions about the VRC, its website and collections can be sent to lso.wsg@yale.edu.