ScreenChomp is one of many great digital creation apps out there for students and teachers to use on the iPad.
ScreenChomp allows the user to record their own voice will creating on the "whiteboard". You use your finger or stylus to manipulate the pens. You can also add backgrounds (images of worksheets, maps, or the classroom clock) from the iPad's camera roll, DropBox, or an image you take right then.
Once you finish and stop the recording, you will immediately see a playback of what you just did. You can do one of three things: (1) delete it, (2) save it to your iPad, (3) share it. If you decide to share, you will get a web address that provides a directly link to your ScreenChomp creation.