A few months ago, Ubisoft announced that they would be facilitating the creation of a map editing guide to be written entirely by the Far Cry 2 map editing community.
It's done (age gated). I finally got my hands on a copy of the finished product yesterday, and I think it's pretty cool. Published by Charles River Media, the guide is hefty and acts mostly as a super-robust handbook for the (already awesome) editor. It discusses all the different classes and game modes and weapons, and breaks out all the different biomes that the game supports, as well as providing a lot of interesting discussion on the design implications of different topolgies, terrains and environments. It touches on the classic pillars of multiplayer map design and even provides detailed indexes of the object libraries (which is very helpful - particularly for the console mapper).
Since most of my readers here are developers, I'll be honest and say I don't think the book would be of much help to a pro (though it's not just for designers, a lot of programmers on our team played with it and were very happy with the results - I would recommend any programmer, animator, or producer who has never been hands on with a level editor give it a try just to see what they can do). Mostly though, for an amateur or hobbyist, or - perhaps more importantly - someone looking for a way to hone level design skills for a resume, I think the book is a really valuable contribution.
I'll also say I'm really impressed by a fan community who can organize themselves around the considerable and daunting task of seeing a collaborative book project all the way through from conception to completion in such a short time.
To see this kind of commitment coming from fans of the game makes me even more proud of it.
Available from Amazon here.