A wiki is a fantastic tool, and they can be very easy to set up. For writing documentation or just keeping a shared whiteboard, that's what I'd use.

Some wiki implementations are really powerful. I hear good things about Twiki and Usemod, though I've never really looked into either.

Everything is capable of a lot more than a general wiki. If you wanted to implement Slash in Everything, you could. (I use the ubiquitous "you", as he has lots of spare time.) It may be overkill, but if you're doing something moderately complicated, you may spend less time learning Everything and doing things its way than adding features that don't fit into a traditional wiki format.

Besides that, we've fixed the installation issues and I'm working on cleaning up the code and making it faster. It still takes more time and resources than a wiki does because it does more. Now if someone would port it to DBD::SQLite, I've got a nice standalone web server....