Audible has an audio archive of a presentation by David Weinberger (of Cluetrain Manifesto fame, among many other things) on blogs, taxonomy and the nature of information storage, retrieval and relevance in a networked world. REALLY interesting.
Well, at least the first half.
In the second half of the presentation, Weinberger's fellow panelists contribute to the discussion. None of them add much to the conversation and frankly, they're no where near as exciting and dynamic as Weinberger. (Read: they're boring as hell...)
That said, the dynamism and enlightenment of the first half easily makes up for the second. Go get it.