No need to bomb them just tell the companies who are doing business in Iran, building it's oil refining capacity (tell them they can't do business in the US and freeze their assets). Iran imports about 20% of it's petroleum needs (despite exporting so much oil) and won't be selfsufficient until 2008 at the earliest.
The Iranian government will soon come around when they can't afford to subsidise refined petroleum products from their neighbours.
It is the heart of Islam that needs to be reduced to rubble... that is in Saudi Arabia...