We already have tried what you proposed with the first team, we've already discussed what we want, and what's needed. We even have a start of the documentation in DocBook format in our repository (under src/ documentation/). While a Wiki might be good enough for end-user documentation (like how to use preferences panel X), it's not for something like the Haiku book. And I definitely don't want to see any documentation team working without a version control system.
Okay, I sort of misunderstood. I thought we were talking about end user documentation. Developer documentation is of a whole different kind.
I need to think about that one.
Niels