There's a long history of comics in the classroom, and the list of references at the end of this article is a great starting point for learning about this concept. While there's still resistance to this medium being used in education - whether by staff or students - there is also a growing movement to use every valuable tool available. Comics have some great uses in the classroom and in a variety of curricula. From pre-readers to high school students, from English to ESL to Science and Math, comics can help students analyze, synthesize and absorb content that may be more difficult when presented in only one way.
This site was really interesting to me. It is kind of focused on older students, however there is also a k-3 section. I played some of the games and looked at the different subjects. It is a fun new age learning site. I think its important for the kids to be motivated to learn more and when you have interesting sites like this that kids enjoy it makes it easier for the information to stick.