CEO, aQuantive (AQNT)
Age: 48
Does Microsoft still matter? The company's campaign to dethrone Google from its perch has so far been a disaster and its bid to crack Apple's hold on digital music with the Zune MP3 player hasn't fared much better. But things may get interesting now that McAndrews has sold digital ad firm aQuantive to Redmond for $6 billion. McAndrews will help Gates & Co. take on Google with aQuantive's Riax, a cutting-edge system for tracking the effectiveness of ads on rich-media sites. Age: 48
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