A well made storyboarding resource. Either use images from the gallery or upload your own. A free sign up is required to save your storyboards.
http://ictmagic.wikispaces.com/English
A superb storyboarding site where users click and drag items onto the screen. A great tool for a class just being introduced to storyboarding.
http://ictmagic.wikispaces.com/English
This is a superb resource for making 3D storyboards and animations. The programme is a little complicated and is designed to be used by older children. It feels similar to Google SketchUp and it will have your class enthralled for hours with creative writing and animating fun. A large download, but worth it.
http://ictmagic.wikispaces.com/Video%2C+animation%2C+film+%26+Webcams