Currency ETF

If you don't want trade currency as a futures contracts or other kind of derivates there is still possibility to trade currency vie exchange trade funds (ETF) on AMEX.
Either for diversification or hedging or just for speculating. My favourite company for currency etf is Rydex. I've listed currency ETFs which I'm sometimes using.

Australian Dollar Trust (FXA)
British Pound Sterling Trust (FXB)
Canadian Dollar Trust (FXC)
Euro Dollar Trust (FXE)
Japanese Yen Trust (FXY)
Mexican Peso Trust (FXM)
Swedish Krona Trust (FXS)
Swiss Franc Trust (FXF)