For 1/1000th the price of expensive conferencing systems, you can add video to your PC and set up your own video conferences. The easiest method of arranging a video conference is to use a free application like Microsoft NetMeeting or Yahoo Messenger plus a cheap webcam.

For one-to-many or many-to-many video, you should look into services like WebEx or Astound Conference Center. Both offer corporate-grade video and Web conferencing services on a pay-as-you-go basis.