If we were to start over again (and if it wasn't just a weekend thing), we would have make the site invitation only and keep the men to women ratio 50:50. Then grow the userbase slowly (with whichever way we could).
Overall, according to our user stats, women had no problem signing up. It's just that we launched in the tech circle with overwhelming numbers of men.
The use of Twitter's Bootstrap in particular seems to be catching on a lot. Your site looks great, Bootstrap was clearly a good choice for it.