A new variation on the Asch conformity experiment was recently published. The experiment was performed in Japan and used polarizing glasses to show different lines to different people in the same room, so that the subjects had to disagree with others they actually knew, and who genuinely believed that they were answering correctly. The study found that women conformed by giving a wrong answer about a third of the time, but men did not.
Learned about this via Ben Goldacre's blog.
Upvoted for reporting the numerical effect. I remember being really impressed by the original Asch experiment, and then floored when I found out it was only 30% of the subjects who caved into peer pressure.