Somewhat biased toward proprietary OSes, and some FUD. But change management of FOS code is an issue.
A wealth of resources on VoIP.
Some of Jonathan Rosenberg's presentations on his website.
You have to register with Business Communications Review to get access to this paper, but its worth it.
This page contains two articles that discuss the difference between H.323 and SIP. (One mentions MGCP/Megaco)
Good chart that compares H.323 to SIP
A brief chart that compares H.248, H.323 and SIP
The Image/Video coding tutorial is a good intro to codecs.
Contains a tutorial on Wavelet Theory, introductory (very introductory) discussion of many common Video Codecs.
dynamicsoft was the premier SIP provider prior to thier acquisition by Cisco.
Our Eastern Regional Manager has taken some pictures on his travels. General interest pictures can be found at his website, http://www.hankkarl.com
While its always been important to have a personal network, the current economy makes networking even more important. It can be tough to keep track of all your contacts because many have changed jobs, and some have changed jobs several times in a year because their company merged, was acquired, or went under. There are a few sites on the web that can help you with this: Personal Networking Resources