We've got a Mac Mini in every conference room, and every conference room represents a "room" in Vidyo. The whole thing is really frictionless. You open the app on your desktop, say you want to join the meeting in Room XYZ, and next thing you know you appear on the TV in there. Everyone also gets a personal "room" so if you're a remote worker and want to call a meeting with people in an office, you can just tell people in a physical conference room to join you by name.
The desktop client is implemented in Flex so it's a little ugly, but still works pretty well. I've been doing several meetings a week over Vidyo for the last six months and it's been pretty seamless.
It sounds like this is the same sort idea, except with Google Apps integration.