there is coming up a new release of OpenMeetings. It includes improved Bandwidth settings and configuration for audio / video streaming. You are now able to choose your Bandwidth. This release is recommended to use with Red5 0.6.3. And of course various improvements to the System.
You can see all necessary information about downloading, installation and the Demo-Portal @ Project Page:

http://openmeetings.googlecode.com

Installation instructions:

http://code.google.com/p/openmeetings/wiki/InstallationOf05RC3Beta4

a screen from Beta5:

http://www.wagner-sebastian.com/screenbeta5s.png