Investors pile into currency ETFs, futures By: MarketWatch December 17, 2009 at 15:54 PM EST They're backing their belief in the dollar's decline with moves designed to gain when the greenback tumbles. Read More >> Related Stocks: RMB/USD ETN Vaneck Ultra Euro 2X ETF Wisdomtree Brazilian Real Fund Wisdomtree Chinese Yuan Strategy Fund Wisdomtree Emerging Currency Strategy Fund