Abstract Expressionism - Provides a history of the art movement with sample artworks. From the Metropolitan Museum of Art. - http://www.metmuseum.org/toah/hd/abex/hd_abex.htm
NGA Kids: Kandinsky - Study the colors, lines and shapes of the 1913 painting "Improvisation 31" by the Russian born artist. - http://www.nga.gov/kids/kandinsky/
WebMuseum: Abstract Expressionism - Brief article about the movement, also called also called action painting and the New York school. - http://www.factmonster.com/ce6/ent/A0802228.html
Abstract expressionism - Wikipedia - Encyclopedia article provides background on the art movement and lists some of the painters who's work is representative. - http://en.wikipedia.org/wiki/Abstract_expressionism
Encyclopedia.com: Abstract Expressionism - Brief overview of the movement of abstract painting that emerged in New York City during the mid-1940's. - http://www.encyclopedia.com/html/a1/abstrexp.asp