The new philanthropy

Warren Buffett and Bill Gates
Microsoft co-founder and Chairman Bill Gates (L) and his wife Melinda Gates listen as investment guru Warren Buffett (R) addresses a press conference June 26, 2006 in New York regarding his pledge of 10 million class B shares of Berkshire Hathaway Corporation to the Bill & Melinda Gates Foundation.
Photo by NICHOLAS ROBERTS/AFP/Getty Images