Edward, you might find this an interesting read.I find it more than coincidence that the: "We must attack Iran" talk started at the same time China was negotiating some very big deals with the Iranians.
This article ("The Real Reasons Why Iran is the Next Target: The Emerging Euro-denominated International Oil Marker") was written before the 2004 elections.
Some interesting quotes:
I don't think that it is the Haliburton connection that has the most to gain from a war with Iran (all due respect to Turbo-1's opinion) but rather it is Big Oil and the hegemony of the US Dollar.Candidly stated, ‘Operation Iraqi Freedom’ was a war designed to install a pro-U.S. puppet in Iraq, establish multiple U.S military bases before the onset of Peak Oil, and to reconvert Iraq back to petrodollars while hoping to thwart further OPEC momentum towards the euro as an alternative oil transaction currency.  In 2003 the global community witnessed a combination of petrodollar warfare and oil depletion warfare. The majority of the world’s governments – especially the E.U., Russia and China - were not amused – and neither are the U.S. soldiers who are currently stationed in Iraq.
Indeed, the author’s original pre-war hypothesis was validated shortly after the war in a Financial Times article dated June 5th, 2003, which confirmed Iraqi oil sales returning to the international markets were once again denominated in US dollars, not euros. Not surprisingly, this detail was never mentioned in the five US major media conglomerates who appear to censor this type of information, but confirmation of this vital fact provides insight into one of the crucial - yet overlooked - rationales for 2003 the Iraq war.
"The tender, for which bids are due by June 10, switches the transaction back to dollars -- the international currency of oil sales - despite the greenback's recent fall in value. Saddam Hussein in 2000 insisted Iraq's oil be sold for euros, a political move, but one that improved Iraq's recent earnings thanks to the rise in the value of the euro against the dollar." 
Unfortunately, it has become clear that yet another manufactured war, or some type of ill-advised covert operation is inevitable under President George W. Bush, should he win the 2004 Presidential Election. Numerous news reports over the past several months have revealed that the neoconservatives are quietly - but actively - planning for the second petrodollar war, this time against Iran.