Projector Central
Projector comparison shopping site. Information and practical advice regarding projectors, screens, and all the accessories. Current prices, user reviews, and buyer’s guides to help you find the right projector
http://www.projectorcentral.com/

PriceGrabber.com
Another projector comparison shopping site
http://electronics.pricegrabber.com/projectors/p/38/

PC Magazine
The Independent Guide to Technology
http://www.pcmag.com/

3M Meeting Network
Delivering Presentations
http://solutions.3m.com/wps/portal/3M/en_US/Products/ProdServ/

Vanderbilt University Center for Teaching
A guide to Classroom Response Systems
http://www.vanderbilt.edu/cft/resources/teaching_resources/technology/crs.htm