The 2009 Fortune 500 list is out. Exxon Mobil Corp. unseated Wal-Mart Stores Inc. in the competition. Exxon shrugged off the oil price bubble and weathered what the magazine called the worst year ever for the country's largest publicly traded companies. They took in $442.85 billion dollars in revenue last year. That is up almost 19 percent from 2007. They also raked in the biggest profit, earning $45.2 billion.