I have to agree with Bastard on this. It's entertaining, but I don't know that this random sampling of blogs will give us much more than rampant speculation. I'm a feminist and so is my wife, so I'm all about women's rights and equal representation, but on my review blog I've read 28 books by men this year and 3 books by women, and one of those was reviewed by a co-blogger of mine. I think it has more to do with what I read and who I relate to. There's nothing wrong with men relating more closely to protagonist male characters (which in turn are more likely to be written by male authors). This whole article was a very interesting read, and thanks for taking the time to put it together. :)

-My Awful Reviews