Here is a downloadable version of the SMART Document Camera - Model 330:


See this video for ideas on the many ways you can use a document camera . In the UK, they call document cameras visualizers.
http://www.ideastoinspire.co.uk/visualisers.htm

Here is the USA version modified from Tom Barrett's UK original using Google Docs:
https://docs.google.com/present/view?id=dc8wnh53_149njwv5dfd

Although an advertisement by AverMedia, a maker of document cameras, this article cites research by Marzano et.al. to support the use of document cameras in the classroom:
http://docs.google.com/viewer?a=v&q=cache:I95qze9nQUMJ:www.kyrene.org/edtech/class_res/doc_cam/links/doc_cam_in_classroom.pdf+research+%22document+camera%22&hl=en&gl=us&pid=bl&srcid=ADGEESiDRG-SNme-1a-qKs9NlFs8_FkxlK7HkUNnD-YjkVOng3Wy30aJaBa6viibIFHHS-2_6PjfutN5FpE9UJe6ssUVpFi6_1fPu1AIA6DZI-Gd3LMxH-fooyDWRHibg7R2GkW0siQY&sig=AHIEtbT4cuVXhvAgSjcLdMgthoH2v4hwPA

Some action research to support use of document cameras in the classroom:
http://blog.sps.lane.edu/posse/action-research/