I read this in one of Andrew Sullivan's posts regarding whether or not Congress would have voted for the war, knowing what they know now:
So if we had had accurate intelligence, the war would not have taken place. I reiterate: I'm still glad we fought it. But this remains one of the biggest government screw-ups in recent history. It has made future pre-emption based on intelligence close to impossible.
I'd have to agree with this sentiment and breath a nice sigh of relief. In the months leading up to the war, many folks, including myself, were worried that if Bush & the neocons got their way, that it would set a precident for unilateral pre-emption. Hopefully, thanks to Bush's and others' incompetance and arrogance, their pilot case of pre-emption will not be viewed as an acceptable policy for quite a long time.