Using Editorial Cartoons. http://hti.osu.edu/opper
Cartoons for the Classrooms is a service that provides lesson plans based on editorial cartoons created by editorial cartoonist. http://nieonline.com/aaec/cftc.cfm# is from Association of American Editorial Cartoonists.
Students can use these strips to show that they have fully discovered the meaning behind the cartoon. Students can also capture meaning by using a comic strip generator, to describe their point of view of an issue that is shown on one of the editorial cartoons.
This last site, AAEC, is also posted on Mario Addesa's blog. Check out his blog for other comic ideas.