Hub of Sparkle is down right now, for reasons unexplained, so I'll link it here.
Ask A Korean! has translated the best analysis I've seen so far on the North Korean Rocket Launch.
Other Must-Read North Korean related material:
How to Disarm Kim Jong-il without Bombing Him: From One Free Korea
and, because no mention of Kim Jong-il should be made without some scorn and derision: a bit of mockery -jong-il