The first floor has Renaissance and Baroque painting and sculpture. Very nice site. This site is very slow because all the thumbnail images are grouped on a single page per period. But give it time. They are excellent images.
Images vary in quality and are patchy in quantity, but a useful resource nonetheless.
Nice scans, but the collection is incomplete. Good place to start for sculpture, but you will need to supplement it. Art Images for College Teaching, Renaissance and Baroque Sculpture and Architecture - nicely organised site with black and white thumbnails on the index page to assist fast loading. Click for good colour reproductions. The only problem is that the sculpture sections are very limited yet.