This is so derivative, but I want these links here when I grep my archives. The following is copied wholesale from peterme, who always finds the sites that won't let go of my brain:
Self-organizing knowledge. Among many links on the intriguing Symbiotic Intelligence Project [cache] page are ones to the Principia Cybernetica Web, which features tons on self-organization, evolutionary theory, etc, including this piece on adaptive hypertext, which shifts connections based on use. One of the researchers, Johan Bollen, has worked on other similar projects, and I found his essay "A system to restructure hypertext networks into valid user models"[.PDF] insightful. He has more recent publications, but they're all in postscript and stuff.
I've added the link to the Symbiotic Intelligence Project myself. I hope that was the referenced site.