This site has a large number of links to many DVC systems.
http://www3.ncsu.edu/dox/video/products.html
Presents clear and simple information.
http://www.teamsolutions.co.uk/video.html
A good source for desktop conferencing standards.
http://www.teamsolutions.co.uk/tsstds.html
Some DVC systems from white pine, Clear and up to date.
http://www.wpine.com/products/
A little old; but has many links
http://www.video-conferencing.com/dt-vendors.html
http://www3.ncsu.edu/dox/video/
A general link to videoconferencing products, and furniture from different companies.
http://www.videoconference-equip.com/prodsvs.htm
A magazine that publishes information about conferencing industry.
http://www.teleconferencemagazine.com/
For FAQ about desktop videoconferencing ..
http://www.bitscout.com/FAQTOC.HTM
A thesis addressing many issues about desktop videoconferencing
http://www2.ncsu.edu/eos/service/ece/project/succeed_info/larettin/thesis/toc.html
A magazine that addresses many desktop multimedia communication issues.
http://www.bcr.com/dvcmag/marapr/default.htm
New listing of videoconferencing products available on the market.
http://picturephone.com/menuprod.htm#internetsystems
Other Links :
http://www.perey.com/
http://www.microsoft.com/netmeeting
http://www.intel.com/proshare/conferencing/products/pvsdata.htm