jolyqr, are you talking about AI engines, or just techniques used in AI?

For example, ANN and GA are just minimization schemes for abitrary non-linear functions. They are not a type of program that can take a decision. But they are techniques that can be used inside an AI engine...

Ruled based AI is not an engine either, it is knowledge representation scheme.

Pathfinding is a goal, not a mean...

Gah, what AI really need is better definitions.

Here is what I would consider as types of AI engines:

a-States Machines
b-Graph explorators
c-Planners
d-Expert systems

If all you want is a list of *anything* related to AI in games, forget my whole post ,go nuts, and add Expert Systems to the list :P

edit: Oh, and my favorite, Kernel Machines (Support Vector Machines and the likes).

i'm talking about methods used by game developpers in oder to make NPCs more intelligent and have believable behaviours.

about your definition of AI method, i'm don't agree with you, but it's not the point...