This blog post has lots of images documenting how to build the PVC pipe iPad document camera / scanning stand.
Document Camera and Projector Setup & Organization - KindergartenWorks
The iPad as the Teacher’s Pet...if I ever get one
50 plus ways to use a document camera in the classroom.
50 Ways to use a document camera in the classroom by grade level.
History of Classroom Technology - Wow how times have changed! Some things are missing though like the Document Camera, Internet, and Pinterest? :)
WeAreTeachers: 20 Fun Ways to Start the School Day Using Your Document Camera
$69 bucks - instead of an Elmo! only downfall - plugs into computer instead of directly into projector.
5 ways to use a document camera in the classroom.
DIY iPad stand to use iPad as a document camera