See Wiki:DanMuller for contact info.
As of May 2005, we are using three internal UseMod-based wikis. The first (mentioned above) is open to all of our development staff, and is actively used by several teams. Another is used (and managed) by a development team that felt more comfortable having their own space. The most recent is a special-purpose wiki for gathering my own team's project requirements, primarily as use cases.