I have the same problem, and I'm female running a tech company. But I have a solution: I teach a group of kids to program, equal gender. Maybe in 10 years I'll be hiring some of them. You know what interests the girls most? I tell them about my lifestyle, my freedom to travel and to live how and where I want, the long lunch breaks I can take if I want (after working hard enough to get employees). By teaching these kids lifestyle options they stay engaged. It's early days yet, I've only just started the classes but I'm enjoying the process.

We're looking forward to the new Stanford CS101 online class, hopefully I can base my teaching on this which should spin off into the kids taking other online classes of their own volition.