I went to a party hosted by an Iranian American friend over the weekend, at which there were, predictably, a number of Iranians. They seemed to have pretty complicated feelings toward their homeland, with certainly no love lost for the mullahs, but also seemed absolutely clear on one point: any US invasion or intervention will be the death knell of that country’s fragile democratic reforms, and will serve only to strengthen the power of the theocratic right. Purely anecdotal; take it for what it’s worth.
On a related note, I mentioned this before, but Persepolis is really worth reading.