Subtopia (subtitled "A Field Guide to Military Urbanism") posts a lengthy discussion (with pictures) of barricade-as-event at the recent G8 Summit:

So, even though neither you or I were there to stroll around the eerie evacuated streets, past the streamers of lightweight warnings and flexible blockades, or what we might call a temporary new aged market place of geopolitical medievalism, a few of our fellow bloggerades hunkered there down under did a more than brilliant job of covering this Subtopian escapade.

[via Super Colossal]