In reply to Tim.

My main point is that the valuable knowledge is tacit (implicit), as we deal with with more creative and complex work. We have to share this tacit (implicit) knowledge in order to work on complex problems. However, it's not a simple matter of knowledge-transfer. Complex knowledge takes time to share and requires trusted relationships to work at understanding each other. Therefore we need to spend more time and effort in informal, social learning activities.
Yes, organizations should try to make tacit knowledge more explicit, but by then, it may be dated.