as of only a couple years ago, more women than men are applying to law school. that doesn't mean, however, that they're adequately represented at the top schools, and they're often not adequately represented on the law reviews of those top schools, for example. there are fewer women in the top 5% at the top schools for sure, and that plays a role in the hiring process (and clerkships) as well.
from what i've heard and read, the avg. female gpa is a little higher and the avg male lsat is a little higher. i don't have facts at hand to back that up, but maybe i'll go scout some out as i seem to miraculously have no assignments today at work. men have traditionally done a little better on standardized tests, but that's finally turning around (e.g. with SAT). rumor has it that a couple years ago yale went to its waitlist expressly for more women; i wonder if that's a result of a lopsided yield (i.e. the guys getting in go there, while more girls they take might opt for e.g. stanford as girl-friendlier).
i don't think women get much extra consideration for being women, but at schools that are farther from 50/50-- in EITHER direction-- it probably helps a bit to be the less-represented gender. i'm sure it helps to be a woman with a less typical educational background, e.g. a woman engineer.
i've been researching how law review selection goes, and i saw at least one school reserving spots for diversity candidates. if the vast majority of those who grade on are men, i'm sure they could use those diversity spots to round out the count some.