Allowing students to express ideas using cartoons develops lots of skills, this site allows students to create their own cartoons and embed them in their online work as well as print. Great way for getting students to express their ideas differently.
Lots of different 'games' to play to reinforce vocabulary for all kinds of subjects. If a student/teacher just wants to create a list of study cards this can do it. If there is a station in your class for vocabulary development you can use this site in lots of different ways to have students practice vocabulary skills. I dare you to try the space race. It's tough!
Creates a graphic of words based on several criteria, can be used to create a graphic of vocabulary from a chapter or a graphic of tags from a class delicious account. Not an end all site, but great way for students/teachers to present a list of topics in a unique way during a presentation. I can see using this to help create a word wall activity using the interactive whiteboard.