The thing to keep in mind when looking at those percentages is thinking about the fact that more women than men buy books, so sensibly, we should be running the joint!
This kind of thing can be discouraging for a young woman writer. I know it is for me. I think about the actions I can take: buy books by women, review books by women, support magazines and publishers who publish women equitably, etc. In the classes in which I have a say, I teach a 50/50 mix of men and women, or pretty close. If I had unlimited funds, I would totally start a press. But it kind of hurts when you’re trying to psych yourself up to send out a poetry packet, or a book manuscript, or a review query, and you let yourself think: these folks publish less than 25% women. And those women are usually already famous. Dang.
What do you all think?

A quick update: Jeanne Leiby from The Southern Review looks at her numbers compared to her submission percentages – eye-opening! Clearly, this is a complex issue with more than one problematic aspect…
Even more updates: Editors take on the numbers here, here and here. And the inimitable Jim Behrle’s take.