Maybe time for a dedicated WP Multisite codex? The information that is out there seems rather difficult to access and use in an efficient manner (totally unlike the main codex, which is GREAT!)
I am happy to volunteer my services, however they may most help, toward getting this done (in the spirit of open source).
A simple branch off the main codex would be a solid start. Simple topics.
Multisite is still kind of new and a lot of techs are still unfamiliar with it. Would be so great to have an official resource.