I authored one of the 55 chapters/articles in "AI Game Programming Wisdom 4." Just like the "Game Programming Gems" series, each book 1-4 is a separate collection of articles by various authors on various topics in game AI. The books are much more practical than textbooks, contain a lot of great video game-specific material (including how the AI for some popular games was done), and the CDs include (2008-era) source code.

I'd recommend them -- most articles are still very relevant. Although they do vary in quality, there are some great reads.

EDIT: Steve Rabin (the editor) has a very high rated new book out called "Game AI Pro: Collected Wisdom of Game AI Professionals" -- http://www.amazon.com/Game-AI-Pro-Collected-Professionals/dp...