That's a great line, KG9. The Chinese threat to Taiwan in 2003 is impressive, but only in the scale of the disaster it would be for the mainlanders. An amphibious assault spearheaded by a few hundred DF-15 missiles and People's boat parade would be an enourmous risk, even without factoring in a U.S. response. The difficulty of the task would be several times harder than the landing at Normandy, and the PRC is just not currently up to the task. At a bare minimum, it is safe to say that, while North Korea could make an attack coincide with our attack on Iraq, China could not.
(Yes, I know the history of the Korean war, but upon closer examination it is clear that these two situations don't have very much in common.)