Shadow Puppets is a new free story telling app released summer of 2013. A very easy to use app that allows you tell a story while scrolling through photos.
A couple of nice features with this app are you can pan photos, zoom in on photos, and point to a location on a photo all while recording your voice.
Stories are saved locally on the iPad in the app, and can also be saved to the camera roll. If you sign up for an account, you can share stories online.
With so many lessons that can incorporate students sharing their understanding of a concept by sharing their thoughts through photos, this is another choice you can have available in your box of story telling apps.