Educreations is a recordable interactive whiteboard that captures your voice and handwriting to produce amazing video lessons that you can share online. Students and colleagues can replay your lessons in any web browser, or from within the app on their iPads. Check out the "Showcase" on their homepage or the "Featured" tab in the iPad app to view some great lessons that other teachers have created with Educreations.
Currently being used in a DLC's Kindergarten classroom to model printing.
http://www.educreations.com