The Integration of AI and Level Design in Halo (2002) - http://www.mediafire.com/?4bbhd2nayn99tdr  
The Halo 3 AI Objectives System (2008) - http://www.mediafire.com/?fnog6u3f08azlmh 
Lighting And Material Of Halo 3 - http://www.mediafire.com/?3d5valm3d1gx2w6 
Halo 3 Audio Post Mortem - http://www.mediafire.com/?uqywdwcuqb349xv  
EVOLVING HALO’S BEHAVIOUR TREE AI (2007) - http://www.mediafire.com/?8e9y2l33zl7ml9p 
Design In Detail - The Sniper Rifle - http://www.mediafire.com/?20hfnshcxstwwdo 
DECISION MAKING & KNOWLEDGE REPRESENTATION IN HALO 3 (2007) - http://www.mediafire.com/?w0jcvvq9lt66akt 
Chris Butcher and 55 other people (2004) - http://www.mediafire.com/?x87544mbhf46w5m 
8 Years of Work on 30 Seconds of Fun (2008) - http://www.mediafire.com/?skcya3pj34db69x 
 
In particular, Jaime Griesemer's 134-page presentation on why he changed the time between the shots for the Sniper Rifle; from 0.5 seconds (Halo 2) to 0.7 seconds (Halo 3) is a brilliant insight into how 'little' things like weapon balancing have to be rigorously thought out beforehand.