"If it is mostly men, we're not alone. It seems like most groups on the internet are comprised of men. I would venture to say that the totality of the internet is mostly men."

i am not sure its so straightforward: Pew Internet & American Life Project Report: Women and Men Online <www.pewinternet.org>

certainly a lot of (confusing) stats there, but the top-level numbers say there are only slightly less women "on the internet". i couldnt find any study of collaborative art sectors, however. heh