A study finds that women do better than men when it comes to remembering faces (and more particularly, women's faces). Here's a possible explanation:
[...]These findings may have an evolutionary explanation that is rooted in female-female competition, says David C. Geary, a psychologist at the University of Missouri–Columbia who was not involved with the study. “Women certainly fought and continue to fight over the best guys ... those with good genes and resources to invest in kids,” Geary says. Remembering details of personal experiences is important for monitoring and maneuvering relationships, including disrupting the social and romantic ties of other women who are competitors, he says. [...]
On a not entirely unrelated note, have you seen this?