Tonight in most areas PBS will broadcast a two hour special on apocalypticism.
The PBS documentary has an elaborate set of web pages at:
http://www.pbs.org/wgbh/pages/frontline/shows/apocalypse/
These pages have articles and interviews representing some of the best current scholarship on the subject. There is also a collection of original documents.
My minor contribution on contemporary stuff is at:
http://www.pbs.org/wgbh/pages/frontline/shows/apocalypse/readings/endtime.html
-Chip Berlet