Cisco's high-end TelePresence systems have been in the channel for years now, and so has WebEx, the collaboration suite that Cisco acquired in 2007. But Cisco is fond of saying that video will be the "killer app" going forward, and it's determined to be part of that story in every aspect, from its existing product lines to its game-changing acquisition of Tandberg. Expected to close any day now following final approval from various government and regulatory bodies, the Tandberg portfolio instantly vaults Cisco to the No. 1 spot in worldwide videoconferencing market share and re-draws the lines among the major video communications powers in the channel. What comes next -- when the Tandberg line is opened up to Cisco's enormous partner network and margins erode -- is harder to predict.