If I were still reading chemical engineering literature on a regular basis, I would have come across this earlier. But someone at the workshop I'm attending mentioned Seeing The Forest At Pfizer from Chemical & Engineering News (C&E News) from Sept 3, 2007.
A radical knowledge-sharing initiative takes hold at the world's largest drugmaker
The big question that arose at the workshop is what makes a wiki work in one organization and not in another organization. The person who pointed to this example works at another Cambridge-based biotech company and hasn't had nearly the same success with a very similar wiki implementation.
One difference I suspect is around the size of the population is critical. If the 1% rule holds, you need a sizable population to get enough active contributors to get value in the implementation.