I started a Wordpress Blog a while back called ‘On the other side of the firewall’, but I never really did too much with it. But now I decided to use it to post entires documenting how to create Blender Add-ons and details on the blender source code files as I go through them.
My first post on Blender is about Add-on’s and how to get your Add-on to a specifc ‘Editor Type’, and how to get your change into one of the icons in the ‘Properites Editor Types’ icons. I also have another page where I am starting to document the functions of different source code files, including the location in the source where you can change the splash screen image on application start 
Blender entry: https://ontheothersideofthefirewall.wordpress.com/2015/08/28/blender-add-ons-and-source-code-documentation-part-1/
Overall site: https://ontheothersideofthefirewall.wordpress.com
While it’s sparse right now, overtime the hope is to make this a good resource for learning to code with Blender.
–Shaun