From Popular Mechanics WORST-CASE SCENARIOS: 3 Forgotten Fears of a Reignited Korean War. (h/t Instapundit.)
(I feel compelled to note that these things are only "forgotten" in the sense that those not in the US military or Republic of Korea don't think about them; trust me, these things are on plannners' minds...)
NYTimes talks to some north Koreans (in China.)
Rantberg brings us Kim Chong Il's Bloody Purges.