The scary thing is Iranian supply concerns are just the beginning. In the near future, around 2010, oil production for the world is supposed to reach a maximum and begin declining irreversibly and every barrel will cost more to extract as well. It's called "peak oil" predicted by Shell geologist M. King Hubbert in the 1950's and is being discussed in congress right now, by Congressman like Republican Roscoe Bartlett from Maryland.
Here is an article talking about problems coming with oil from
http://www.itp.net/business/features/details.php?id=3639&category=
I am one that thinks we are in the beginning stages of many showdowns for oil resources with other nations, possibly leading to WWIII. Iraq, Iran, and Venezuela(U.S.'s third largest oil supplier) are just the beginning. It's when China and the U.S. get into a conflict that things will get interesting. The great game of trying to acquire the world's last remaining resources for ourselves has just begun.
Oh and there's a reason that China is building its military faster than anyone has since WWII. They plan on having to use it soon.
Jet