Nice Girls Don’t Ask
Here's another article on gender inequality in the workplace. This article focuses specifically on wages, and why women typically earn less than men and on women's underrepresentation in the 'top jobs'.
Although not the first to point this out, the authors say that women do not negotiate as hard or as much as men do and use some empirical data to support their point.
Harvard Business Review Summary: Managers who pride themselves on giving employees what they request may be shortchanging women, simply because men ask for a lot more than women do. This can be costly for companies, and it requires management intervention.