Dell CEO Michael Dell, right, and Sir Martin Sorrell, chief executive officer of WPP Group, walk to a morning session at the annual Allen & Co.'s media summit in Sun Valley, Idaho, Thursday, July 9, 2009. AP Photo logo AP Photo 4 months ago

Dell CEO Michael Dell, right, and Sir Martin Sorrell, chief executive officer of WPP Group, walk to a morning session at the annual Allen & Co.'s media summit in Sun Valley, Idaho, Thursday, July 9, 2009.