According to this video Iran said they were going to start selling oil for Euros in 2006 and set up an independent exchange for other oil rich countries. It also indicates that Saddam started selling oil in Euros in November of 2000. And that immediately after the invasion the US switched oil sales in Iraq back to the dollar, costing Iraq 17% of the total value of it's oil.
I just read the following article.
"U.S. escalating covert operations against Iran"
http://rawstory.com/news/2008/U.S._escalating_cove...
U.S. congressional leaders agreed late last year to President George W. Bush's funding request for a major escalation of covert operations against Iran aimed at destabilizing its leadership...
Hersh has written previously about possible administration plans to go to war to stop Tehran from obtaining nuclear weapons, including an April 2006 article in the New Yorker that suggested regime change in Iran, whether by diplomatic or military means, was Bush's ultimate goal.
And we also have this:
"Iran says Gulf oil route at risk if attacked"
http://rawstory.com/news/2008/Iran_says_Gulf_oil_r...
"Regarding the main route for exiting energy, Iran will definitely act to impose control on the Persian Gulf and Strait of Hormuz," Jafari said of the Gulf waterway through which about two-fifths of all globally traded oil passes.
Iranian officials have in the past sent mixed signals about whether Iran would use oil as a weapon. But such threats, when made, have sent jitters through the crude market for fear of disrupting supplies from big OPEC producers in the Gulf.
Just maybe in 2006 the Administration started to ramp up concern for Iran and make plans to topple the government because the leadership of Iran figured out ways to really threaten the U.S. economy.
Are we going to bomb Iran to defend the dollar?