Screenchomp!

I am currently working on stories of cells with a science teacher. We decided to use screenchomp http://itunes.apple.com/us/app/screenchomp/id442415881?mt=8 because of its simplicity and we have a cart of ipads. The students are going to use an image and then write on the pic and narrate their stories. I will share an example of the final product when we are done. Any other ideas of how you could use screenchomp or the similar jing http://www.techsmith.com/jing.html?gclid=CPzmmOfT5K0CFWnatgodExIzYQ as a storyteller?