请用英语回答：Who are the top 10 of the richest men in the world?

CLICK To Know Top 10 Richest Person In The World 2009

1) The American investor and philanthropist Warren Buffet is worth an estimated $62 billion, up $10 billion from a year ago thanks to surging prices of Berkshire Hathaway stock, according to Forbes magazine's annual ranking of the world's billionaires.

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2) Mexican telecom tycoon Carlos Slim Helu was named the world's second richest man, with a net worth of around $60 billion, up $11 billion since last March.

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3) Bill Gates, the co-founder of Microsoft, is now ranked as the world's third richest person. At $58 billion, his net worth is up $2 billion from a year ago.

4) Steel giant Lakshmi Mittal placed fourth with 45 billion dollars

5) Petrochemicals tycoon Mukesh Ambani placed fifth with 43 billion dollars

6) Anil Ambani at sixth position with 42 billion dollars