Is there an ETF that tracks the USD?

I'm looking for a stock or ETF that tracks the USD, or is at least strongly correlated to it. Gold would be an example. Any others?
 
Quote from S2007S:

UUP - PowerShares DB US Dollar Index Bullish (AMEX)

Thanks for that. I wonder if there are others.

As I type this the USD is puking.
 
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