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7. Google
Fortune 500 rank: 150
The search king may be a one-click pony, but its profits climbed 37% to $4.2 billion in 2007. Google is moving to diversify beyond search advertising with its $3.1 billion acquisition of display ad company DoubleClick and a push to make YouTube pay off.

NEXT: 8. Apple
Last updated April 24 2008: 11:04 AM ET