Clash of civilizations or not?

Interesting overview of the issue of the clash of civilizations that many have been talking about in recent times. It also mentions Huntington's concept of the "swing civilizations": essentially fault lines between core civilizations which are doomed to remain conflict points for a long time. He speaks of "bloody borders", where blood will spill over and over again, before the previous blood has had any chance of drying up. And all in all, he puts religious identity at a very high position in the list of factors for defining geopolitical blocs and the respective clashes.

There are some criticisms of this theory...