To answer the original question, why is the North Korea situation not a "crisis"?
Very simple answer. North Korea is not Iraq. What do I mean? Let's first look at the Iraq situation.
We have a serious situation in the Middle East. The Israeli-Palestinian conflict continues. Saudi Arabia is extremely unstable. Iran is undergoing something of a civil conflict between the conservative Mullahs and young students. On top of that, Iraq is still attempting to produce weapons of mass destruction. Then there was 9/11.
Iraq is an unfinished business. Aside from dealing with the simmering problems we have had with Iraq (continuing menace to Kuwait, WMD, assassination and terror attempts), toppling of the Saddam Hussein regime offers a unique chance to demonstrate American will and resolve in combating those that dare to offend it in the region. As such, Iraq is not simply about Iraq, but about the entire region - the region that happens to have produced the 9/11 terrorists.
Now, let's look at North Korea. Though menacing, nothing that the North Koreans have done has changed the strategic equation in East Asia. Both South Korea and Japan, though occassionally squabbly with us, are staunch allies and exceptionally stable societies. China, while antagonistic much of the time, is nonetheless an ally of convenience while Russia is not much of a player anymore in the region. That leaves North Korea isolated and vulnerable. For North Korea to initiate any kind of conflict would be to incur a collective suicide of the ruling class.
What's going on in North Korea is a gimmick, a stunt, a game of chicken. Because we are preoccupied with other, more pressing threats, North Korea has decided that this is an ideal time to blackmail us into more aid. Sadly for North Korea, Bush is not the sort of president easily given to pathetic (and quite frankly idle) threats from a fourth-rate country nor is the country at large in any mood to entertain buying threats off with money after 9/11.
Watch North Koreans backpedal with the gusto of Lance Armstrong when they really get our attention.