Since it has obviously been decided by the US that the invasion of Iraq is a given, let's look at what will happen the day after.
It looks as though my predictions are becoming reality. Turkey is not going to sit by and watch the US liberate a huge Kurdish population which presently lives in IRAQ. They perceive this as a threat and will act (with invasion) accordingly. Obviously oil is the main issue. The US in the meantime wants Turkish cooperation and is willing to pay for it.