There's something to be said for compiling a single list of good references and resources later but in the mean-time I think there's some benefit in separate threads for separate resources. Updates can then be posted when new versions are, and the content of each particular resource can be debated or discussed in detail.
(Thanks for link, Wormeaten)
The official Arma 3 Tactical Guide, "Tactics, Techniques, & Procedures 3", can be found via the following links:
Free version: http://ttp3.dslyecxi.com
Amazon print version: http://goo.gl/Nn5XGD
BIS Full-color version: Coming soon!
Note that the paid versions include additional bonus content on a variety of topics.