I am proposing to start a product management Q&A site. Any product company is driven by a product management department with product managers. Today, you do have User Experience site which is all about the products user experience. Product Management is a huge field combining market analysis, Pricing, User experience, Roadmap, Defining requirements, managing releases, writing specs and many more.
I think today, there are many product managers out there in the world, both experience and Juniors, and even the experience are probably experience in several fields but not in all.
I strongly believe that there is a place for Q&A site for product management