althought it's WAY to late to implement this plan now, my plan went something like this:

EASE UP ON IRAQ, that's right, make Saddam think we're no longer on his case, ease up the embargo, etc.
this will relax the Iraqi's guard and allow our agents to penetrate Iraq, the spies would then surely find concrete evidence of WMDs and links to terrorists.
then we could attack Iraq with proper backing from our allies.