video distribution

Hello, I have a "state of the state" sort of question for you guru's out there. If I wanted to make a number of video streams available across an IP WAN network, I have a couple of options. Unicast or Multicast. Unicast isn't the most efficient method necessarily so my preference would be Multicast. Now since it's been years since I've thought about Multicast, are there any hot new technologies or methods available for video transmission over an IP network? Thank you very much for your time. Regards, Christopher J. Wolff VP CIO Broadband Laboratories, Inc. http://www.bblabs.com