YouTube's response to Vine & Instagram, MixBit allows you to shoot, edit, and post video from your mobile device. Technically an iPhone/iPod app, it would work on iPad.
This free app creates a private diary that stays completely on iPad. For elementary students without the ability to create accounts, this could be a good solution. Notes can be exported via email.
This free app seems to be a cross between Keynote, Haiku Deck, and Polleverywhere. Some interesting features including templates and polling capabilities.