The basic outline of the oil motive is inescapable:
When we invaded, we cancelled Saddam's contracts with the Russians, French, and others, and not just replaced them, but de-nationalized Iraq's oil, so that our companies could take a greater share of the profits from Iraq's oil.
PNAC, former national security advisor Zbigniew Brzezinski, Henry Kissinger, and pretty much any serious foreign policy player has discussed the importance of controlling the natural resources, especially oil of Eurasia, in scholarly articles, speeches before think tanks, and books. The world's oil supply is declining, and the companies that control the spigot where it will dry up last can control the economies of countries that need oil--and reap unimaginable profits.
Unfortunately, it's already obvious that power won't be used for the benefit of average Americans.
You can see a timeline with the relevant documents and interviews with government, oil industry, and occupation leaders here:
http://www.gregpalast.com/iraqmeetingstimeline.htmlAnd the final plan the oil companies are pushing for now:
http://www.globalpolicy.org/security/oil/2005/crudedesigns.htmWhy don't most people care or talk about this?