"The Art Of War" is great, I read this version when I was 13 but I would still recommend it as a good place to start before getting another translation or other books:

"Sunzi Speaks: The Art of War"

Tsai Chih Chung

http://www.amazon.com/dp/0385472587

Some online reading that you might find interesting:

http://www.ingber.com/combat97_cmi.ps.gz

http://www.ndu.edu/inss/Symposia/joint2008/papers/Hoffman%20...

http://www.ndu.edu/inss/Symposia/joint2008/papers/Warden%20P...

http://www.dodccrp.org/files/Smith_Complexity.pdf