For sharing lesson plans, curricula, teaching theories, methodologies, in the most useful way, I'm considering using existing wikibooks or wikiversity. Leaning toward the former.
My hesitation is potentially losing quality/consistency/messaging control. But I don't think that's a big risk, because hive mind is good, and it's fine to be super active as an editor, and I can always leave.
I had been assuming I'd use Confluence, but then I heard that it might get expensive in the next few years. Then I thought of the value of direct community input.