Iran makes no secret of the fact that it manufactures weapons for export, including mortar bombs of the general type found in Iraq. Customers from around the world can log on to the Web site of the government-owned Defense Industries Organization and view a wide array of Iranian-made munitions. If they decide to order, they apparently can pay by credit card, as a VISA logo suggests. The site - which promises "best quality and fast service" - is an example of the vigor with which Iran has moved into a global arms market long dominated by the United States and...