Interesting video on the way information is categorised in the physical world and the digital world. David Weinberger (author of Everything is Miscellaneous) talks about the limitations of physical categorisation systems such as Dewey Decimal Classification (e.g. things can only have one place) and the advantages of digital categorisation (e.g. hyperlinks, tagging etc.). One of the many tools of the web which is really becoming utilised.

[googlevideo]http://video.google.com/videoplay?docid=2159021324062223592&q=%22everything+is+miscellaneous%22&hl=en[/googlevideo]