Story boarding is creating graphic organizers in the form of illustrations or graphics displayed in a sequence to visualize stories.
Here are two sites that are very nice for story boarding.
Picture a Story -
This sites lets students choose the many features of their story including genre, background, characters, props and the script. It also allows the student to record their story and then email the story to multiple email addresses.
Story Board That -
Story Board That has a drag and drop interface that is super easy to use. Students choose the characters, scene, and speech bubbles. They need an account to share and save their story board.