There's a jaw-dropping depiction of the use of JSOW's in Tom Clancy's book, "The Bear and the Dragon". I'm not sure how acccurate the portrayal is (knowing Clancy, it's probably pretty good), but if the real weapons can perform anywhere near as well as the description in the book, the Iraqis are in for a rude awakening.
Imagine a short-range (if you can call 40 miles "short") cruise missile full of armor-piercing cluster bombs. What's unique about this is that *each* cluster bomblet has its *own* independent guidance system which it can use to autonomously spot a useful target and home in on it. *One* JSOW can conceivably take out a *dozen* or more tanks.