These blogs are definitely worth a look:

1) https://molecularmusings.wordpress.com/ 2) http://bitsquid.blogspot.com/ 3) http://gamesfromwithin.com/

They can feel a little esoteric but there's a lot of golden nuggets if you're willing to dig a little.

Also, check out this book by Jason Gregory: http://www.gameenginebook.com/