I was incredibly impressed with the audience. There were literally hundreds of people, most of them men. To me, it proved once again that the men in this industry are determined to "fix" this problem of gender imbalance. And they're happy to extend that to improving diversity as a whole, once you highlight the bigger problem. It says to me that this is not naturally a misogynistic industry, where you have to fight against the boys club to get anywhere. It says to me that we are all in this together. After all, in the "real" world the geeks are still outsiders, and different, so we're used to embracing our different-ness - whether that's because you're the only girl in the room, the only Java developer at a .NET conference, or the only techy at a dinner party.
Conferences are a self-selecting audience, I know - these are the people who are investing time and money in advancing their careers, or at least encouraging their employers to do. But for the punchline of this session, these are exactly the right people. We need to go out, tell everyone how much we enjoy our jobs; tell kids that programming is cool, and show them it's fun; mentor other people, and each other, and be a role model. I don't care what gender you are or what colour you are or what your dark secret is - you are the role model to inspire someone.
Just do it.