Found this over at Bitch, Ph.D.: yet another response to the Summers' comments, this time from the presidents of MIT, Stanford, and Princeton. This is probably my favorite response thus far.
The essay is well worth reading, but here is my favorite paragraph:
"Why is this so important? Our nation faces increasing competition from abroad in technological innovation, the most powerful driver of our economy, while the academic performance of our school-age students in math and science lags behind many countries. Against this backdrop, it is imperative that we tap the talent and perspectives of both the male and female halves of our population. Until women can feel as much at home in math, science, and engineering as men, our nation will be considerably less than the sum of its parts. If we do not draw on the entire talent pool that is capable of making a contribution to science, the enterprise will inevitably be underperforming its potential."