Confluence does only accept up to 200 registered users. I see the day where additional users can not register any more. I think we should clear about how to deal with that. Also: "Your commercial Confluence support and updates are available until Oct 05, 2007."
The big question is, if we really should depend on a wiki that has a limited license and - again - is not open source. I was very much for working with Confluence as it was what we had - but we should reconsider . We need a wiki with at least unlimited user base. I dont want to make me too much comfortable with Conluence if i can see the limits by now.