Strategypage has this interesting post:
Iraqi Shiite cleric Moqtada Sadr announced that he would come to the defense of Iran if Iran were attacked. This makes it pretty clear that Sadr is Iran's creation, and the recipient of much financial and other aid.
Besides raising the question I've asked repeatedly since 2003 of why this man is still alive, it raises the possibility that Iran could indeed make mischief in Iraq if we attack Iran. Sadr will do his masters' bidding when the time comes.
Of course, we know this already. And if we are planning to attack Iran it would actually make sense to leave Sadr and his people in place, compile lists of people and arms caches at his disposal, and then wait until the eve of action to then kill or arrest them all at once. This would disrupt Iran's ability to raise the ante in Iraq and prevent the Iranians from building a new network that we don't know about to replace Sadr.
So I'll be keeping an eye on any news about official actions against the Idiot Sadr and his minions (man, I want minions of my own...).