Webcast of a talk Weinberger gave at Oxford last year:

The New Shape of Knowledge: From Trees to Piles of Leaves

The digital revolution is enabling knowledge to slip the bonds of the physical which had, silently, shaped it. Now we get to see its "natural" shape. What does it look like? How big are topics when they aren't determined by the economics of paper? Who gets to organize it? What are the new principles we're using to organize it? David Weinberger proposes that in the digital world, the most "natural," efficient and responsive way to manage knowledge is to create huge, distributed piles of leaves, each tagged with as much metadata as possible – including treating the content as metadata – and postponing until the last minute the taxonomizing of the information. What will be the social effects as we move from trees to piles of leaves?