Wikis in general tend to arouse some strong reactions in teachers (I guess we've all seen what Google and Wikipedia have done to research in many history and social studies classrooms...) yet I thought some people might find this useful, especially towards the start of the year when you look back over your units. Which of course we all do. Of course.
Yes it is a concise essay expressing complex changes very succinctly. The Website from which it comes looks very useful too. A number of Key historical topics and periods each with some original articles, book reviews, recommended websites etc. It is backed by the very reliable Institute of Historical Research see:
http://www.history.ac.uk/ihr/Focus/index.html
The long read: Our year of remembrance has exaggerated the tragic futility of the first world war and preserved the dangerous idea that the second was noble and heroic
Another of the excellent sourcebooks run by those Jesuits at Fordham Uni. This is the best online primary source research for the ancient world I've found.