Syracuse University
Draw Your Own Conclusions: Political Cartooning Then & ?
Take a look at how wars and politics from the 1860s through the 1960s were drawn by some of the nation's most influential humorists and cartoonists.
Contemplator
Contemplator's Short History: John Gay and the Beggar's Opera
A biography of John Gay. This site also contains many related links including one of the the entire text of his play, "The Beggar's Opera."
Library of Congress
Loc: Cartoon America
includes political illustrations, gag cartoons, Online collection that includes comic strips, illustrations, animation, and caricature.