Interesting fact: in the U.S., single, childless, women under age 30 in urban areas earn more (10-20% in cities like New York) than single, childless, men under age 30. See: http://www.time.com/time/business/article/0,8599,2015274,00.....
This is not to undervalue the statistic presented in the article, but I'm always a bit wary of comparisons involving "equivalent education and experience." In Denmark, for example, 20-30% of women (depending on the study) work part-time, versus 8-10% of men. How do you compute "equivalent" experience with a part-time worker? Is 5 years of working an 80% work-week "equivalent" to 4 years of working full-time? Does a 30-year old woman who took 2 years off after college for childcare reasons have "equivalent" experience to a 28-year old man who did not? Mathematically that works out, but part-time work and time out of the workforce are death-blows to a resume, far out of proportion with the resulting differential in actual amount of experience.
I appreciate the ideas discussed in the article, but as the father of a daughter and the husband of a very ambitious woman, I have as slightly different perspective on the issue. Yes, it is important to avoid bias that results from the perceptions of men higher up in the hierarchy. At the same time, it's crucially important to look at the other irrationalities in the system. I think it's irrational that a women who takes a year off after the birth of a child is viewed by HR managers in a worse light than a man who took a year to backpack across Asia. I think it's irrational that men are never expected to be the ones who downshift their careers for a time to help raise kids. I think it's irrational that a period of downshifting is perceived as such a negative light in the first place.