I just made an observation primarily for myself but willing to share it as a comment. There are quite many women in the authors mosaic on the front page of the Open Advice web-site.
I find that nice, that women this numerous have found interesting things to do, learn and have fun from these projects instead of coding. I know there are women coding and doing many tasks just like men and there are men equal or more to women in the mosaic as well, I just didn't count the genders in the mosaic. I don't mean this comment to be taken as a sexists role model. Somehow the authors mosaic just stroke thru better than Valerie Hanson's name and awereness of her gender in a Kernel section article. As another example, if I remember right, Rebecca Sobol has been working for FOSS via lwn.net since its very early days.
Despite of many acknowledgable women in FOSS, my perception has been that FOSS scenery has had heavy bias to males and I'm not one of those keen on changing the situation by making fuss over it (actually just made with this comment, but will keep my denial mode). The book and the above observation definately changes my perception. I think I will buy the book, not because what I said above about women vs. men in FOSS, but purely because the book review gave incentives.
If someone finds this comment amusing because of its hairline dancing, it is just because I live in a country, where I'm just sick of women being nervously sensitive to counter argument comments they find sexists. I'm almost giving up posting this comment, when I think about that cultural behaviour we have. If conversation between genders is hard in real life at times, online conversations make it to power 2 and conversations over cultural borders might make it even more hazard.