Saddam's support of Al Qaeda was never alleged to be more than superficial - one meeting with Mohammed Atta does not constitute support. Since that meeting is in dispute, I'd say the evidence of "shelter and support" is pretty thin.

Yes, Saddam did violate his ceasefire agreement after 1991. It's debatable whether the best course of action would have been containment or invasion.

In any event, Dave's primary point (and which I agree with) was that Afghanistan was both more directly responsible for and more of a threat to the US than was Iraq. Nor was Iraq "going anywhere" - we could (should) have made sure we were finished in Afghanistan before jumping to Iraq.