Personally, I have noticed a huge increase in the number of women gamers since my early gaming days. Perhaps it's just from my point of view since I was "retired" from gaming for over six years until I returned to it two years ago. Maybe it was gradual... regardless, alot of women seem to play now. I'm into two groups, both are nearly 50% women. I have been thinking gathering up some of the things I've put together that seem to appeal to my female gamers and release them as either a large article in Asgard magazine or look for an online publisher of some sort. This is all in the early stages though.
As a DM I have noticed a substantial gap between what my female gamers want out of the game and what's supported in the D&D system. 75% of the time they are looking for the same thing guys are (action, adventure, etc), but there are some things that don't overlap as much.
I'd love to see more resources for NPC interactions, reactions, formulas for creating backgrounds for them, etc. More things that go into details when it comes to clothing, goods, etc (find me a single magical dress in the DMG). More details for dancing, etc, or anything else that tends to interests men more then women. I just feel like the D&D seems to support mostly guy's "interest" and for female's interest things, I have to create on my own from scratch. I am aware of the demographics and that companies make money by catering to their customers desires, but I think WoTC could benefit by expanding their customer base a bit.
Anyway... sorry if that came across as a rant, it's mostly just personal observations (apologies also for my vast politcal incorrectness).