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While doing some fact-checking for a monograph Marc Noland and I are writing on the sad history of trying to engage North Korea, I had reason to check the MOU website and was reminded of a useful source for analysts, scholars and students: the MOU’s incredibly granular Important Events 2009-Present (the page will launch where I was using it in 2014, but you can adjust the month in a pull down box; unfortunately it does not yet include 2015 content). Diplomatic exchanges in the form of diplomatic statements as well as actual communications and meetings were much more frequent than might be thought throughout this period, although rarely with significant effect. But if you are looking for a source for these last six years, this is ripe for a coding effort.
The site also maintains an incredibly detailed list of all North-South dialogues from 1971 through 2009, but with less commentary; it literally is a catalogue. Although most of the meetings listed are those associated with armistice structure, the site effectively traces the ups-and-downs of North-South talks as well, from the early Red Cross meetings through the high engagement period and into the Lee Myung Bak freeze.