Omg, I’m blogging! Well, first maybe some stuff I’ve been doing at present. This will mainly be GPU rendering and Direct3D/OpenGL topics. There’re many interesting blogs caring about such issues:
BrainDump by flo
Flo is lead dev at RadonLabs in Berlin (Nebula2+3 engines, Drakensang game for example)
http://flohofwoe.blogspot.com/
Diary of a Graphics Programmer
http://diaryofagraphicsprogrammer.blogspot.com
Blog of Wolgang Engel (ShaderX books, Rockstar games dev)
http://realtimecollisiondetection.net
Christer Ericson’s blog (Sony dev)
http://drkappa.blogspot.com
Dr. Kappa’s Korner. Graphics blog.
http://www.realtimerendering.com/blog
Real-Time Rendering blog, by sackboy from LittleBIGPlanet project, There’s also a book with that name ^^
http://levelofdetail.wordpress.com
LOD stuff, but also posts about shadows, Radiosity, etc.
Ampere's Blog 