I applaud your effort. I have upvoted this.
I will suggest you devote more effort to developing a means to talk to companies about "best practices" and how to do this better. Try to frame it in a non judgey fashion. Try hard to avoid sounding like you are moralizing. People will interpret your position that way anyway simply because of the space you are in. You will need to kind over compensate for that to have any hope of being heard as not being on your high horse about this.
I liked the Design for Diversity section. At the moment, all the titles I am seeingseem to be about web and app design. I hope you have plans to also write about how companies can design the company to attract and retain a diverse work force.
Let me suggest you do your best to find good research and to frame it in terms of what is in it for the company. I like your bit about how much job turnover costs. You need more in that vein. Case studies of how to do this sell and how it promotes success for the company would be a good thing.
I don't know where I saw it recently, but I have seen stats that correlate diversity to profitability. This would be another good angle to high light: Hey, all you Programmers, you are leaving money on the table.
If I ran this, I would be angling to help non diverse companies do this better as a means to further my mission and grow my user base/potential paying customer base. I will suggest that helping companies find "low hanging fruit" -- I.e. relatively painless ways to promote diversity -- would be a great way to start enticing companies down the slippery slope of goodness here.