Stewart Mader and I had a good conversation, and from it came references to these posts; I'm noting them now here so that I can find them again (!) and so that I can remember the context of the conversation.
Five effective wiki uses - a piece in Website Magazine. In short: project management, customer/client collaboration, documentation, online community, FAQs and policies.
Onboarding: getting your new employees cleared for takeoff - some wiki patterns associated with using wiki to answer new hire questions and otherwise get new people to be part of an organization
When to wiki and when not to - wiki as complementary, not replacement technology; wiki to do work in progress, but PDF for final publications; using a public wiki next to a traditional static published site; and using wiki as a content management system.
Does your organization have these boundaries to communication? On using enterprise wide wiki systems to let people from different parts of the organization discover each other so that they can collaborate.
Thanks to Sunir for the connection! And, note to self, start with Skype next time instead of telephone.