Since ProShare Advisors launched its first inverse ETFs in June of 2006, hedging your portfolio has never been easier. Little wonder that the Bethesda, Md.-based money manager has garnered a whopping $16 billion in assets in less than two years. All you have to do is buy the Proshares Short S&P 500 ETF (AMEX: SH) and your portfolio is protected from any market downdrafts, which lately have become very drafty indeed.