Peter Csathy, on his blog today, waxes on about the second Viacom network to add real time video interaction between the show and the video audience.
To me this is the radio call in gone the video route, something that never worked well with just voice.
From a technical standpoint, Viacom had their choice of software to use, but based on what they saw, they went with SightSpeed because the quality makes the broadcast level grade.