eventhough the USD weakened considerably after hitting a high in March 2009, the USD didnt fall to its 2008 low
in 2008, the USD index almost hit 70
in 2009, it found support a bit above 74 and went as high as 78 before ending 2009 a bit below 78
the USD could strengthen further in 2010
the Fed is unwinding the extraordinary measures it used to keep the financial system from collapsing (meaning it is pulling out some liquidity out of the system) which is USD positive
interest rates on US treasuries are rising... which is also USD positive