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8. Oprah Winfrey
Oprah Winfrey
Chairman
Harpo
2007 rank: 8
Age: 54

Oprah's next launch? OWN: The Oprah Winfrey Network, which will debut in more than 70 million homes next September. Although her magazine's circulation has fallen 10% in the past three years, it remains the advertising leader in its category.

NEXT: Brenda Barnes
Last updated October 16 2008: 10:16 AM ET
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