John Hughes at the Christian Science Monitor writes about Why Iraq is not like Vietnam. Worthwhile reading. Iraq is indeed not like Viet Nam in many important respects, though just how much comfort we should take from that fact alone is not clear.
As an aside, I have always been impressed by the journalistic integrity of the CSM. But for the phrase "Christian Science" (an oxymoron if ever there was one) in the title you'd never know that they were run by a religious organization, and one with some fairly extreme views at that. For being able to do that they have my respect.