Just discovered an entry from the Knowledge El Dorado, Thanks for the Memories that points to an HBS Working Knolwedge article on the topic with this list of recommendations.
- Create a knowledge profile
- Foster mentoring relationships
- Encourage communities of practice
- Ensure that passing knowledge on is rewarded
- Protect people's privacy
- Decide whether you're interested in recorded knowledge as well
This is familiar. And as I mentioned earlier, this can only work if it is part of the existing business processes. Doing it last minute is bound to fail and create resentment amongst the outgoing parties.