I've often had the "Why don't you have more women's stuff?" conversation with my LBS - the owner of which happens to be a good friend of mine.
I think the fact is that many small shops (such as the one I go to) have a limited amount of floor space, and they stock what sells. So, until we get our sisters in the shops (and *ahem* off mail order), the smaller shops will cater to the ones who plunk down the heftiest hunk of change.

That said, I think it would be helpful for a shop to park prominently in the front window two things: a woman's bike and a big ol' sign saying "Great new women's styles...on sale NOW!" At least that would cater to a few things near and dear to my heart: Gear, clothes, and "on-sale."

So, it's kind of a chicken and egg quandry: How do you get women in the shops, if there's nothing there for them, and how do you get shops with limited resources to stock items for a demographic who doesn't show up??