Valerie's interesting comments are in line with one of the reasons I've stayed off of this list in the past. I am ok with women having a space without men around, just like I feel men should be able to have a space without women around. I'm familiar with a workplace where at least one employee lounge is female-only, and considering that many of the employees of both genders have union representation, I suppose that the employees as a whole support having that lounge be the way it is. In the Wikipedia context, if some women wanted to have a supportive email list or social network group only for women, where women could talk in relative privacy, I would say go for it.
Interestingly, I was invited, completely sight unseen and with only the most basic of introductions from a third party, to attend an edit-a-thon at what I believe was a female-focused software engineering workspace. I told the person who invited me that I was uncomfortable with stepping into the women's space, and she assured me that as long as people are respectful that everything would be ok. I'm not the type of male who would invite myself to an event like that, nor do I plan on setting up workshops for the opposite gender. I thought it was remarkably open of the women to invite me into their space, especially knowing relatively little about me. I guess they felt safety in numbers? I'm not used to getting that kind of invitation!
Anyway, if some of the WikiWomen want to set up a relatively private and supportive space just for WikiWomen, I'd say that sounds like an idea worth trying. If there is some need for resources, IdeaLab and the grants programs stand ready to hear requests. (:
Pine