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Khan Academy
Khan Academy: Art History: Paul Cezanne: The Bather
Features an in-depth look at Paul Cezanne's painting 'The Bather', which is an excellent example of Post-Impressionism art.
The Wharton Group
Discover France: Art Periods: Cubism
A detailed history and explanation of the ideologies behind cubism. Lots of cubism links as well.
Van Gogh Gallery
The Van Gogh Gallery: Henri De Toulouse Lautrec
Biographical account highlights the life and career of French Post-Impressionist painter Henri de Toulouse-Lautrec.