Berkshire-Hathaway and 3G team up again as Heinz merges with Kraft Foods.  But is Warren Buffett on the hunt for yet another big deal?  Merck and AutoZone announce stock buyback plans.  Motley Fool Funds analyst Bill Barker shares why AutoZone shareholders should be more happy than Merck’s.  Plus we dip into the Fool Mailbag to talk annual meetings and proxy statements.