Who matters now?

Online video is supercharging Internet traffic, and with it Cisco's profits. Since the bust, Chambers has diversified his company from network routers to set-top boxes, Wi-Fi gear, and Web-conferencing software. Its recent acquisitions of a handful of social-network software companies have raised eyebrows in Silicon Valley, but some say it's all part of a push to find new ways to drive more Internet traffic -- and hence sell more Cisco gear.

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Tell us who you think matters now -- and why