For seven years Warren Buffett, the so-called Oracle of Omaha, ranked just behind his good friend and bridge partner Bill Gates as the world's second-richest man. That era is over, at least temporarily. On March 29, Mexican telecom titan Carlos Slim Helú quietly slipped past the value investor. As of market close today, Slim is worth $53.1 billion, compared with Buffett's $52.4 billion. He is also breathtakingly close to passing Gates, currently worth $56.0 billion. .... Slim added $4 billion to his fortune in the two months since we locked in net worths for our annual billionaires rankings. http://www.forbes.com/business/2007/04/11/billionaires-helu-telecom-biz-cz_hc_0411helu.html