Perhaps I laud him too much (I see his name is quite big in my tag cloud), but here is a 17-minute talk given by Clay Shirky at the U.S. State Department last month.  It is the epitome of what gets me excited about this whole damn thing we’re living through.  “Web 2.0” is just scratching the surface.

http://video.ted.com/assets/player/swf/EmbedPlayer.swf