Just in case we don't have all our information covered here's some sites to expand your knowledge of art history.
Images and Info
Mark Harden's Artchive: Lots of quality images, plus some information about the artists
Webmuseum: Contains an overview of art history, artist profiles, images, and critques
Art History Resources on the Web: A very comprehensive links site to art history information
University of Michigan's Art History Links: A comprehensive links site that includes online exhibits, research resources, etc.
The National Gallery of Art: Comprehensive site that talks about the museums, events, and temporary exhibits, as well as artist info and an image library
Museum of El Prado: A good resource on Spanish arts and artists
Musee D'Orsay: Provides information about the museum and its collections
Musee de Louvre: Contains images of their collection, and a virual tour among other things
The National Gallery of Canada: Contans audio and video files, interviews, and lots of images