Let's share blogs
I've found these, focused on coding:
>blog of the graphics/engine programmer of Total Annihilation game series including its (spiritual) succesors
http://www.mavorsrants.com/
> A guy who mostly does very detailed analyzations of the rendering of modern games
http://www.adriancourreges.com/
> Some guy who makes some game, shares his technics in c++
https://rootllama.wordpress.com/
> Gaffer On Games: ESSENTIAL reading if you want to do game networking, also has some articles on physics
http://gafferongames.com/
> Blog from another guy who worked on Supreme Commander / Planetary Annihilation, has a nice article explaining the networking in SupCom for example
http://forrestthewoods.com/
> I haven't really checked this out a lot except for the article on immutable strings
http://seanmiddleditch.com/
> L Spiro writes articles about creating a game engine, she worked on Final Fantasy VII
http://lspiroengine.com/
> Fabien Sanglard, amonst other things, dissects the engines by idSoftware (Quake, Doom), and more
http://fabiensanglard.net/
I hope some of you have some that I missed.