Apple broke its way into the top 10 of the Fortune 500 list of top American revenue earners for the first time today, making an impressive leap from No. 17 to No. 6 since last year's rankings. Fortune also lists it as the second most profitable company in the United States after Exxon Mobil. This can only be good news for Apple in the wake of recent concerns about its falling stock prices and its shaky hold on the smartphone and tablet markets, and it stands as a stark reminder of the tech giant's potential for growth in spite of increasingly grim projections.