While there are quite a few women around (more than you'd expect), it's a very small minority. Most homebrewers that I see and know are male.
There was a joke at the National Homebrew Conference played on me. A guy said he was looking for a buddy. I asked what he looked like. He responded, "Between 30 and 40, white guy, slightly overweight, with some facial hair". I looked up, and there were 3500 people in front of me with that exact description!
So it's still a male-dominated hobby, but the person who won "Homebrewer of the Year" this year was an African-American woman, so we're making strides in branching out a bit.