Comic Strip
Creating comics is a great way for kids to use their creativity, show something they have learned, or teach someone something new.
ReadWriteThink has a comic creator made just for kids. It lets you choose one through six panels for your comic. The characters, props and backgrounds to choose from are kid oriented. You cannot save the comic to view it online. It is printable in black and white, which is great for adding color with pencils or markers afterwards.
Make Belief Comix is another simple to use comic strip creator. It allows you to email a copy of your comic strip to someone as well as printing it.
ToonDoo is a more sophisticated online cartoon strip creator. ToonDoo has lots of backgrounds, characters, and props to use in creating your strips. It allows you to save your comic and publish it to the web. ToonDoo keeps track of stats on how many times your cartoon has been viewed (important to some kids!) and you can embed it in a blog.
ToonDoo is NOT a place to let the younger kids play unsupervised. Some of the cartoons contain crude language and adult situations. I would advise setting up a login for your kids, logging in for them, and heading to the MyToonDoo section. That will get your kids past the home page which may or may not have inappropriate materials.