With all the craziness we are seeing in the stock market over the past couple of days, you had to expect changes across the board, but the fact that Apple has just overtaken Exxon Mobil at the top of the market came much sooner than expected. Apple, at least for now, is the most valuable company in the world. We don't mean most valuable technology company--we mean most valuable company, period. This is an amazing feat for a company that, just over a decade ago, people thought was on the verge of backruptcy.