I've seen the "Female X chromosome 'cracked'" article being linked to around the blogosphere in the last couple days so I thought I'd check it out. What I found was very interesting.

"The discovery, by an international consortium of scientists, shows that females are far more variable than previously thought and, when it comes to genes, more complex than men."

Nature reports two new studies; one on the complete sequencing of the X chromosome for humans, which sheds some light on how sex evolved and how women differ from men, and another on how women express many genes from X chromosomes previously thought dormant.