This is a very interexting piece on potential motivations for the current war on Iraq. There are a number of interesting bits in this article, and it is fairly long, but well worth the read.
Quick overview: The Euro standard is making grounds against the dollar as the oil exchange currency, which is a bad thing as the market will be flooded with dollars, devaluing our already hurting unit. Iraq made that switch already, and that in conjunction with the Caspian Sea being far under expected yield (suddenly Afghanistan is much less interesting!), W switches the war machine over to Iraq.