I used this book for a Game AI class and the examples were easy to consume with a good focus on using the methods in real games: http://www.amazon.com/Artificial-Intelligence-Games-Ian-Mill...

A little pricey, but my favorite intro book for this subject.

I'm currently working my way through this book Artificial Intelligence for Games [1] and am finding it very approachable for someone with no background in AI.

[1] http://www.amazon.com/Artificial-Intelligence-Games-Ian-Mill...