Free eBook: Java AI
I just noticed this on Meercat, I'll have to delve in when I get a moment, this stuff fascinates me:
Practical AI Programming in Java (free book)
"Practical Artificial Intelligence Programming in Java" is a free web book written by Mark Watson that covers Java implementations (with complete source code) of some common AI techniques including search, NLP parsing, statistical NLP processing, expert systems, genetic algorithms, and neural networks.
The author, Mark Watson also has a blog, which seems interesting also... cool stuff.