[ShaneWilton]

It's not a tutorial, per se, but Game Programming Patterns is a free online book that explores common design patterns in game development: http://gameprogrammingpatterns.com/

As a non-game developer, it's been one of the most invaluable resources I jump too when trying to optimize something.

[philsnow]

I bought this book and finished it in a couple hours. It's fun to read and the examples are well-illustrated, but it doesn't go into very much depth on anything and its breadth isn't terribly wide either. I would say it's good for people who are learning programming in order to learn to make games, but people who are already programmers won't get much from it.