I'm glad that armor piercing attacks against US forces in Iraq have declined but
attributing this to the success of the Basra offensive which was supposed to have somehow -- and nobody in the article explains any causal mechanism -- to have crippled Iranian capabilities is a bit bizarre. It's not clear how much of these attacks ever had anything to do with Iran, but insofar as Iran is playing a role the obvious cause of a decline in the tempo of attacks is efforts at "appeasement" like the Bush administration's somewhat renewed interest in diplomacy with Teheran and so forth.
This article available online at:
http://www.theatlantic.com/politics/archive/2008/07/iran-in-iraq/49351/