I think OpenERP used to have a public wiki in the past, but turned it off for a whole bunch of reasons

• hard to maintain and control quality
• filled with outdated information
• etc.

We are currently focusing on this Q&A and, on the developers side, we try to document our code through tests and rst files (see What's the best way to write documentation for my module and give it visibility ?) which are rendered over there: http://doc.openerp.com/trunk/developers/index.html

This is correct for developers. But I use wikis to document workflows. For example an "Onboarding guide" for new employees. Different departments write and update different parts on same wiki. e.g. personnel department maintains howtos for holiday, disease a.s.o. administration department maintains howtos for login, logout, rights a.s.o.

I think a wiki would be really helpful. A Q&A is very confused to maintain for a department. Which questions are maintain from which department?