All I'm really interested in is the content, not the packaging, but after three weeks I'm already weary of seeing the same style presentations. I'm really glad I found MAKE BELIEFS COMIX! Online Educational Comic Generator for Kids of All Ages It's free, online and easy to use. The best part is that it gives me a new method for them to illustrate concepts learned!
Disclaimer: I found this site through a simple web search and in no way was paid or encouraged to endorse them :D