Doodlecast is an app($1.99) for the iPad & iPhone that I just downloaded for the kids. This is a great educational app that allows people to record their voice while drawing/doodling (Voicethread has something similar like that). Where the learning goes it helps students tell a story about their drawing or select one of the writing prompts and draw using a template. Finished movies can then be uploaded to YouTube.
I recommend checking out Doodlecast by clicking here!!