Currencies have been extremely volatile lately as the U.S. devalues the U.S. dollar. Currency ETFs is the place to be for trading the wild swings.
Here are current straddles for currencies. If QE2 disappoints or exaggerates, then currencies will continue their wild movements. If QE2 is as expected, $500B over 6 months, then, not much will change.
Computed with StraddlesCalc Tool
Please do your own due diligence. This is not advice. Options are very dangerous and may cause 100% loss.