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What variety of hedges are there against index funds of U.S. based stocks?
Even though "when the U.S. sneezes Canada catches a cold", I would suggest considering a look at Canadian government bonds as both a currency hedge, and for the safety of principal — of course, in terms of CAD, not USD. We like to boast that Canada fared relatively better (PDF) during the economic crisis than many other advanced economies, and our government debt is often rated higher than U.S. government debt. That being said, as a Canadian, I am biased.  For what it's worth, here's the more general strategy: Recognize that you will be accepting some currency risk (in addition to the sovereign risks) in such an approach. Consistent with your ETF approach, there do exist a class of "international treasury bond" ETFs, holding short-term foreign government bonds, but their holdings won't necessarily match the criteria I laid out – although they'll have wider diversification than if you invested in specific countries separately.