Choices recorded this talk to teachers by Jonathan Pollack, a leading expert on North Korea. The talk was in 2009, but most all is extremely relevant given the events there right now.

The talk has six parts, each fairly short, but packed with interesting information.

A History of North Korea
The Two Koreas
A Nuclear Timeline
Negotiations
Concerns About North Korea’s Nuclear Program
Where Do We Go from Here? 

http://vimeo.com/album/2332174

We also have a some additional resource suggestions here and a short curriculum with a roleplay, Conflict on the Korean Peninsula: North Korea and the Nuclear Threat.