Fascinating Peterson Institute lecture by Niall Ferguson on the implications of government debt and on what he believes will occur after Greece which he predicts will default.

http://www.piie.com/events/event_detail.cfm?EventID=152&Media

And here is the slide show that accompanies the lecture.  The video is about an hour.  You can skip the first 13 minutes which are introductions.

fiscal crises and imperial collapses