Retail giant Wal-Mart (NYSE:WMT) revealed a significant milestone in its February 17 quarterly and full-year earnings results. Fourth quarter sales, which are typically the highest for retailers due to holiday shopping, again exceeded 12 digits. In addition, its $405.6 billion in sales for the year ended January 31, 2009 pushed past the $400 billion barrier for the first time. Wal-Mart's ability to maintain control of its sizable warehouse stores throughout the world is mystifying. Showing little sign of losing focus any time soon, Wal-Mart remains one of the safer bets in the stock market these days.