Museums:

The Louvre
http://www.louvre.fr

Musee d'Orsay (19th-century art)
http://www.musee-orsay.fr

National Gallery of Art (French Impressionism)
http://www.nga.gov/collection/gallery/french19.htm

Paris and Print-Making in the 19th Century (Toulouse-Lautrec)
http://www.sdmart.org/lautrec/index.html

Creating French Culture: Treasures from the Bibliotheque Nationale de France
http://lcweb.loc.gov/exhibits/bnf/bnf0001.html

Rodin Museum
http://www.musee-rodin.fr/

Photography
http://www.bnf.fr/pages/expos/paris/index.htm  (French only, exhibit of photos on Paris)

Artists

Gustave Courbet
http://www.ibiblio.org/wm/paint/auth/courbet/

Honore Daumier
http://www.philophil.com/philosophie/representation/Textes%20clefs/legislatif.htm
http://www.philophil.com/philosophie/representation/Textes%20clefs/prison-daumier.htm
   

Edgar Degas
http://www.ibiblio.org/wm/paint/auth/degas/

Eduard Manet (see also National Gallery above)
http://www.ibiblio.org/wm/paint/auth/manet/

Claude Monet
http://www.ibiblio.org/wm/paint/auth/monet/

Pierre-Auguste Renoir
http://www.ibiblio.org/wm/paint/auth/renoir/

Henri Toulouse-Lautrec
http://www.sandiegomuseum.org/lautrec/intro.html
http://www.ibiblio.org/wm/paint/auth/toulouse-lautrec/

Marcel Proust
http://www.bnf.fr/pages/expos/proust/anglais/index.htm
 
 

Renaissance Art

http://www.ibiblio.org/wm/paint/glo/renaissance/
http://www.ibiblio.org/wm/paint/auth/vinci/
http://www.ibiblio.org/wm/paint/auth/vinci/sketch/

Art in the Grand Siecle
Portraits of Louis XIV  http://www.assumption.edu/HTML/Faculty/Gallo/Louis.html
The Art of Food   http://www.getty.edu/research/tools/digital/ediblemonument/index2.html