These are two others that I have stumbled across. I think it's really interesting to look at these wiki's and see what makes them good/bad, attractive/not, etc. I think there can always be something to learned..I've looked at these extensively, and even made accounts on them to explore the process. I encourage others to experience and perhaps share what you think makes these different, good/bad, etc, compared to Wikipedia.
Global Women's Network has videos on how to do things a simple as create a user account...which I think is nice.