Cartoon movement

http://www.cartoonmovement.com/
Cartoon Movement is a community of international editorial cartoonists and fans of political satire originally set up by set up by Tjeerd Royaards, a Dutch editorial cartoonist. It seeks to promote examples of good political and satirical cartoons. Browse the online gallery. They include political cartoons with recent examples relating to Syria. the environment and economic crisis. Copyright information is displayed on the website. http://www.cartoonmovement.com/cartoon 

In the UK if you are looking for historical political cartoons you can browse the resources at the University of Kent cartoon archive. http://www.cartoons.ac.uk/