DimDim software appliance requires monster resources and virtualization. See the readme at:
http://internap.dl.sourceforge.net/sourceforge/dimdim/Dimdim_Software_Appliance_v3.5_Readme.txt
One problem here is that resources to make video/audio conferencing work are HUGE. Seems to me that there are Moodle Partners providing 1 Elluminate classroom for $5K. The server and admin costs to manage such resources in-house might well be seen as prohibitive.
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