While browsing around the iTunes App Store, I discovered an application (app) called AirSketch. AirSketch turns your iPad into a wireless ”whiteboard” for your classroom. You can also edit and annotate images and PDF files live on the screen in your classroom, as well as save the annotations to a file for storing or email.
You can choose the free version of AirSketch for whiteboard only functionality. Or, the paid version if you would like to include images and PDF files in your whiteboard activities. Follow the link below for more information.