More WMD shipments from the US to Israel.
Endless "peace keeping"(aka massmurder) in Iraq.
If Iran slips up and does anything to indicate they're supporting the rebels, giving GW an excuse (or maybe he'll just make more shit up) we may end up with a war we'll need a draft to fight.
Iran may even be willing to detonate a nuke on Iraqi land*, (tho perhaps by proxy) as neither the US nor Israel are likely to use nukes themselves unless the attack was on their own resepective homelands. Though can you imagine how much of our military could be wiped out if they're crowded into one city like fallujah? or the Baghdad 'green zone'?
It's quite an opportunity for the "Death To America" regime.
Iran doesn't really give a shit about the Iraqi people (after their war w/ them); they would just like more influence over the land/oil.
*this assume Iran has/gets nukes. (we're going to be there a long time) How close they are seems unclear at this point. I wouldn't put it past North Korea to just sell them one. Then they get to hit us for free and basically get away with it. All kinds of nasty possibilities... Nobody trusts Bush. Almost approaching a second cold war.