From Apps in Education Blog..15 Presentation Apps for the iPad that coupled with a VGA adaptor will allow you to present with ease and elegance. Whether in the classroom, the network meeting or even the Boardroom.
ScreenChomp is a free app for creating and sharing short tutorials or lessons on your iPad. ScreenChomp provides a whiteboard on which you can demonstrate things by drawing and talking people through your instructions. ScreenChomp records your voice as you go. When you finish your recording share it to ScreenChomp.com where a shortened URL will be provided for you to share with anyone you like. From ScreenChomp.com you have the option to download recordings as MPEG-4 files.