The Powerball jackpot is now over half a billion dollars.  Tomorrow's drawing for an estimated $550 million offers a cash payout of just over $350 million.  It's the third biggest lottery jackpot in U.S. history after no grand prize tickets matched Wednesday night's big drawing.  Of course, your odds of walking away with all that cash are astronomical at roughly one in 175 million.  Powerball is played in 43 states, Washington, DC and the U.S. Virgin Islands.