The following sites are associated with game development in general:
http://www. gamasutra .com/
http://www.flipcode.com/
http://www. gamedev .net/
The next three sites are associated with AI:
http://www.gameai.com/
http://www.gameai.com/ games .html
http://www.aihorizon.com/
For an explanation of a minimax search with alpha beta pruning, check out the following site:
http://www.cs.cornell.edu/courses/cs312/2002sp/lectures/rec21.htm
O'Reilly published a good book about game physics. Beware: The book requires a substantial amount of calculus and linear algebra:
http://www.oreilly.com/catalog/physicsgame/