This powerpoint presentation contains an overview of techniques for teachers.
This online version of Gene Yang's Master's degree project proposal features extensive expository on the benefits of comics and education, as well as a large selection of links and, for secondary math teachers, an extremely good flash-based comic illustrating factoring.
A history of comic art and culture. Contains many examples, and a detailed (albiet dated) chronological record of important events in comic history.
Plasq is the publisher of the Comic Life software, which allows for the simple creation of comics from photographs or illustrations. It is easy to use, surprisingly affordable, and an excellent educational tool.