Valerie Plame's work focused specifically on Iran...

Raw Story exposes.

According to current and former intelligence officials, Plame Wilson, who worked on the clandestine side of the CIA in the Directorate of Operations as a non-official cover (NOC) officer, was part of an operation tracking distribution and acquisition of weapons of mass destruction technology to and from Iran.

Speaking under strict confidentiality, intelligence officials revealed heretofore unreported elements of Plame's work. Their accounts suggest that Plame's outing was more serious than has previously been reported and carries grave implications for U.S. national security and its ability to monitor Iran's burgeoning nuclear program.

Juan Cole explores the ramifications...

So between disrupting the work of Plame Wilson's unit at the CIA and letting the Iranians know about the broken codes, the pro-war party managed to make Iran's actual progress on nuclear research opaque to the US government. It was necessary that it be opaque if there was to be a war. Iran is actually a decade or two away from having a bomb even if everything went well. But US intelligence agencies must be less confident they know what is going on in Iran now than before the Neocons destroyed so much of the effort against Iranian proliferation. It was the US withdrawal of inspectors from Ira[q] in 1998 that created the uncertainties that allowed Bush to invade Iraq. For warmongers, good intelligence on the enemy's capabilities is undesirable if that intelligence would get in the way of launching a war.

Still, it is just speculation.

If the speculation were true, the scale of treason emanating from Rove and Cheney and his staff is scarcely imaginable.

(emphasis mine)

This makes a lot of sense, I hope it's not true.