The National Gallery (UK)
The National Gallery of London: Bathers at Asnieres
View the famous painting by Georges Seurat; includes a short description of the painting subject and how and why it was done.
New York Times
New York Times: George Seurat: The Drawings
A video slide show of George Seurat's drawings: "Woman Reading in the Studio," "Tree by a Road," "Lighthouse at Honfleur," "Pierre and Colombine," "Drawbridge," "The Ragpicker," "Antique Statue, Satyr With Goat," and others. Narrator...
National Gallery of Art
National Gallery of Art: Camille Pissarro, Vincent Van Gogh, Paul Cezanne
This site from the National Gallery of Art provides a tour of the leading artists of the post-impressionist movement: Van Gogh, Gauguin, Seurat, and Cezanne.
Other
Art Republic: Neo Impressionism/pointillism
This site provides a description of the neo-impressionistic movement and mentions some of the more famous neo-impressionist painters.
The Wharton Group
Discover France: Art Periods: Cubism
A detailed history and explanation of the ideologies behind cubism. Lots of cubism links as well.
The Wharton Group
Discover France: Art Nouveau
This site contains information on Art Nouveau in great detail. Find out what this term means, and how this "new art" adapted from old styles.