AI will be my future field of study (alongside robotics ) so I'd say that I am an adept fan of AI.

Though I am not as good as I'd like to be, I understand many basic concepts and principles of different approaches and sub-topics in AI.

I also have read Matt Bucklands tutorials on NNs and GAs and I found it to be quite a nice appraoch to incorporating the two for practical use.

And for those that want to get into some great low level stuff for their games I recommend 'AI for Game Developers' by David M. Bourg & Glenn Seemann -- O'Reilly (ISBN 0-596-00555-5)

Great read and a nice reference for later on too. There was another one that covered directly specific game genres, but I didn't have as much cash as I needed for both. Forgot the title of it...