There are two big stories about WW1. One is the geopolitical, diplomatic one, which goes back until the 1870's and arguably shows the effect of WW1 until at least the Cold War, if not until today (look at the Middle East for example). This perspective that can be stretched over a near century and a half is fantastically covered by Stanford's James Sheehan in the lecture series The History of the International System (feed). Part of this story is the question how the war came about and who is to blame, which is an issue every modern history series will deal with (History 5, MMW 5, European Civilization 1648 to 1945, History 1c) but is especially well done by Margaret Anderson in an old version of Berkeley's Renaissance to Today. Also interesting is the interview in New Books in History with Norman Stone.
Another big story of WW1 is that of Trench Warfare, or a little bit more broadly, how the war went and how it culminated in the wretched peace of Versailles. Many good podcasts give ample attention here. (New Books in History, History 151c, France since 1871, The Armistice Podcast)
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While Veertien Achttien is expected to run until 2012 in Dutch, there are some rumors it may be translated into English at some point in time. We can only hope that this challenge will indeed be met.