There have been a couple recent interviews with prominent figures in game AI development. The first is over on PC Gamer, talking to:

• Jay Stelly, Valve developer for Half-life.
• Steve Polge, programmer at Epic on Unreal Tournament.
• Paul Tozour, AI designer on Thief and Deus Ex.
• Jon Owen and Greg Stelmack who worked on the AI & programming for Ghost Recon

Quite an amazing cast if you ask me, the interviews are right here: Our Kingdom for Kick-Ass AI: The Interviews.

There's also another good interview with Craig Hubbard and Jeff Orkin about their latest production. No One Lives Forever 2 AI Q&A. There are some quite interesting insights in the development process, and how the feedback of the players contributed to the development. A good read too!