i Tell a Story is an excellent free app for digital storytelling. To me this closely resembles how Garageband is used to create a podcast. A user can upload a photo and then record their voice narrating a story. Best of all a person can add sound effects from a built in sound library or any audio from their iTunes library. A finished story is save as a mp4 filed and can be shared w/ others via email.
I highly recommend checking out i Tell a Story by clicking here!!!