http://www.valvesoftware.com/publicatio ... _booth.pdf
Very good read indeed. Not just for AI.
edit: Where did you find this? Couldn't find it on the website..
Are there more pdf's like this one?
Develop games in your browser. Powerful, performant & highly capable.
I like Reactive Path Following & Climbing. I wish there'd be someone who could turn it into a plugin for C2.