kdm-manager.com officially said "Hello World!" on 2015-12-02 in the /r/KingdomDeath sub-Reddit: Online KDM campaign tracking tool?
Following that secretive "announcement", I worked with the volunteer testers from that thread (via Reddit PM and email) for a few days to refine the design, tackle the biggest usability issues and work out the major kinks.
A few days later, I decided to cast my net a little wider, and created a thread to solicit feedback from anybody who felt like checking out the Manager: Check Out My Mobile Campaign Manager
This caused a small explosion in registrations: we went from 12 registered users to 206 in five days.
It also caused a small explosion in changes/fixes/improvements/features and general development activity.
In order to organize and archive communication about features and updates, I built an in-app change log.
The next step, from here, is the creation of this blog, which will redirect from blog.kdm-manager.com. The point of the blog is to provide a more feature-rich, desktop-friendly resource for managing development and collaboration around the Manager.