Bill Gates may be the richest man in the world, but the Microsoft co-founder is <A HREF="http://www.cnn.com/2005/BUSINESS/11/18/gates.philanthropy/index.html">no longer considered America's top giver,</A> according to an annual ranking of the top U.S. philanthropists. Known for co-founding the microchip firm Intel, Gordon E. Moore and his wife Betty unseated Gates and his wife Melinda in BusinessWeek's fourth-annual list of the America's "50 Most Generous Philanthropists." While the Gates have given significantly more, nearly $28 billion to date, the Moores have given a higher percentage of their net worth, according to BusinessWeek.