Harold and Allyn; Thanks for the thoughtful discussion. Wikipedia, although open sourced, is still a central repository that has great value to me. Hagel, Brown and Davison's ideas about organizing around "pull" resonates more with me as an explanation of why the central repositories of KM might have been problematic. KM's central metaphor was about pushing (mostly decontextualized) knowledge out to workers, organized around centralized command and control decisions. Pull is about tapping into the cross-disciplinary learning networks on the boundaries of organizations where knowledge flows in specific contexts. Instead of controlling and protecting knowledge stocks, it depends on serendipity and social learning networks and that can greatly increase the possibility of serendipity. It is a compelling vision to me although it may require a difficult change in mindset for businesses and needs more good examples to confirm it's validity. I also think that a "pull" view of PKS would emphasizes knowledge's social and meditational aspects over it's representational aspects.