I don't think we need diversity, we need the best minds and ideas. I don't care what the gender is.  The minute you start filling positions to acheive some sort of quota you begin to get less talented people in those positions.  If you want to have the best world class leading companies, than you better focus first on talent and last on diversity.  

That being said if you feel it's important to have more women in a male dominated field, you need to get women interested. The guys that go into many of these high tech fields aren't just interested, they are passionate and driven. If half heartedly interested women are going in to fill a quota, they won't last.