The US dollar ($US) is on a roller coaster. And since S&P downgraded Greece to BBB+, the dollar has been on the rise. One can attribute the recent shift in the $US to many things - improving US economic conditions, return to risk, or relative weakness in other G7 countries, whatever. But what is clear, is that the dollar's gaining some strength, 4.7% since the beginning of December on a trade-weighted basis.
But this is not sustainable. As economic recoveries diverge (i.e., the G7 recovery is expected to be slower than that in key emerging markets), the dollar will likely fall. That's just gravity, and a necessary condition for sorting out global trade flows.
Gravity will drag the $US
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