REVIEW & OUTLOOK: "Pain Iran Can Believe In," Wall Street Journal, 25 March 2009.
The effort to go after Iran's energy Achilles heel (gasoline production/importation) seems logical enough to me.
Yes, other suppliers can always take up the slack whenever we force a Western company to adhere, but a bit more pressure on this point right now would signal some additional resolve and give us something to bargain away down the road.
Iran imports about 40% of its gasoline.
In general, I don't like sanctions, but the timing and specificity here are attractive.