Although Toon.books.com is a site that is selling their books , there is a lot of content that can be used by teachers who want to incorporate cartoons or graphic novels into their classroom. Under the Educators tab, you can find a Comic Genre study, an article on Why Comics? And also CCSS-aligned Teachers' Guides which includes common core standards, lesson plans, and activity sheets. There are also guides to some of their books.
Under the Just for Kids tab, you will find cartoon makers, read along videos, toon craft activities, and tips for parents. So I think this would be a good site for teachers who want to use cartoon and graphic novels in their classroom.