SUN VALLEY, ID - JULY 07:  Warren Buffett, chairman of Berkshire Hathaway, attends the Allen & Company Sun Valley Conference on July 7, 2011 in Sun Valley, Idaho. The conference has been hosted annually by the investment firm Allen & Company each July since 1983 and is typically attended by many of the world's most powerful media executives.  (Photo by Scott Olson/Getty Images)