I have used most of the tools on the list with my students. They really enjoy creating Animoto videos on given topics and since I have the educator's subscription, it is much easier for them to create their videos. I just wish more characters were allow in the text, but this does make the students choose their words wisely to get their point across. Big Huge Labs is great for creating trading cards, posters, magazine covers on historical figures or characters in a story. Xtranormal is fun for the students to use, but I like using it as an intro to a particular unit or concept. It grabs their attention.
For comic strips I use http://www.toondoo.com/ and http://marvelkids.marvel.com/activities allows students to create a 22 page comic book to print.
Two new sites on the list that I want to explore are Storybird and Storyjumper.
Below is a mosaic of school supplies created in BigHuge Labs.