Let me preface my post by stating I have always believed the path to victory in Iraq is through the streets of Tehran and Damascus. That being said there may be a way to achieve victory over Iran without the public impotence of sanctions and diplomatic maneuvers (One need only glance 90 miles south of Florida to recognize my point.)
History has also shown us that bombing, whether specifically targeted sites or en masse population centers have the tendency to unify a people rather than destroy a national will. The mullahs and Ahmidinijad are counting on the US and it's Allies to do what they have been unable to do for quite sometime. They will make the United States an enemy in the eyes of the Iranian population at large.
There are three subgroups of Iranians; those who lived under the Western influenced Shah, the militants (their baby-boomers) and the Under-30s who are definitely tired of the theocracy.
Consider the United States recognizing the Shah of Iran's son as the rightful government of Iran and supporting him to form a government in exile. Second action; transmitting information into Iran via radio, television and Internet regarding protests around the country. The third step would be providing free gasoline near border areas, create "Petrol Refugees".
That would cause the regime to lose control of the internal movements of the population and social and political breakdown on a local level due to resource shortages.
I know it's a skeleton but it can be fleshed out a bit.