With long New York Times articles, I usually read the first page or two and give up, but this one is worth reading through, at least if you find discussions of gender differences interesting.
Basically, women have scooted ahead of men in academic studies, not because men are doing worse but because women are doing better. Guys are more likely to slack off, women have their eyes on the prize.
An interesting result of this is that the difference is getting more notice than some feel it deserves. There are larger gaps between races in college than sexes, but apparently the men-women gap is a hot topic.
Of course, the question is how will this play out after college. Will employers snatch up these honor-laden women while guys get the lesser jobs (except in the hard sciences, where men still rule). Or will men still win out simply because that's how it's always been. I'm expecting a change, more girl bosses and CEOs, but only time will tell.