AirSketch turns your iPad into a whiteboard that can be projected, without having to use a VGA adaptor. Not only does this save you from purchasing an adaptor, but without having to attach a cord, it ensures your iPad remains mobile. AirSketch can be used as a simple whiteboard, or you can load an image or pdf, and use AirSketcch to annotate it. You can save your AirSketch whiteboards once complete, and email them to yourself and/or your students.
Cost: $7.99 (a simplified free version is available as well)
Click here for more information in AirSketch
Click here to access Air Sketch in the iTunes App Store