I have used Read, Write, Think a ton this year! It has amazing resources for grades k-12. There are lesson plans, interactives, and printouts.
A good friend of mine that teaches first gave me this book of comics. My boys have loved it! A few of mine asked if they could write a comic...ummm YYYYYESSSS! Anything to get our boys to love writing! It has tons of comic book resources here. My favorite was this one, The Comic Creator! The kids get to compose their own comic strips. They get to choose backgrounds, characters, and props. There is a comic strip planning sheet for the kids to use as a draft.