A talk bt Tom Morris at BarCampBrighton4 in September 2009 drawing parallels between URIs on the Web and Saul Kripke’s causal theory of names as presented in Naming and Necessity (http://icanhaz.com/namingandnecessity). The first half is rather technical and dry, but gets more practical as it goes on.
You can also download the talk from Rapidshare or BitTorrent - both of which enable me to keep my bandwidth bills low:
Rapidshare: http://rapidshare.com/files/280438449/resource-naming-and-necessity.mp3
BitTorrent: http://s3.amazonaws.com/tommorris/resource-naming-and-necessity.mp3?torrent