The gender gap argument never held much weight for me... there are a number of studies saying that if you adjust for a certain number of factors, the gap is pretty narrow (IE women who didn't take time off to have kids, etc)

While women now make up a majority of college students, there is also a factor of what they study. They make up just a third of top-tier b-schools, for one thing, and a smaller number at engineering schools.

Here's an interesting study: Women don't negotiate... http://neweconomist.blogs.com/new_economist/2006/07/menstrua...