"Many teachers are simply unaware of what a powerful tool an Elmo document camera can be for all students, whether advanced, regular, remedial, English Language
Learners, or students with learning disabilities." ~ Karina Clemmons, Ed. D.,Orange County Public Schools

While you can certainly use a document cam the same way you've used an overhead projector, I'm pretty sure the resources below will help you take your camera way beyond the overhead projector.

Document Cam Overview:

Instructional Practices: