Shawn Callahan has a set of suggested Knowledge sharing principles with a client. He starts with "We will share what we know with our colleagues" and goes from there with a number of similar entries that get at the idea that the organization wants to be a knowledge sharing company.
He is also looking for guidance on anything he might have missed, so go have a look. My comment on his list was that there should be something in there that guides people to be interested in their colleagues and their colleagues' needs & interests. Essentially, not only should we share what we know, but we should share what we discover that appears to be relevant to our colleagues needs.