We all know that women make up a small fraction of the developer community, so it should come as no surprise that women haven't contributed much to a product that has historically required a little understanding of "programming" in order to edit (of course it don't seem like programming to developers, but to non developers it is scary). With an easy to use interface for editing articles, that is strongly advertised and pushed (despite community objections), Wikipedia could start to make headway with gaining women editors, but overcoming history is not going to be easy.