If you want to read a concise yet informative and clue-backed report on advanced persistent threat, I recommend completing this form to receive the first Mandiant M-Trends report.
Mandiant occupies a unique position with respect to this problem because they are one of only two security service companies with substantial counter-APT consulting experience.
You may read blog posts and commentary from other security service providers who either 1) suddenly claim counter-APT expertise or 2) deride "APT" as just a marketing term, or FUD, or some other term to hide their inexperience with this problem. The fact remains that, when organizations meet in closed forums to do real work on this problem, the names and faces are fairly constant. They don't include those trying to make an APT "splash" or those pretending APT is not a real problem.
Mandiant finishes its report with the following statement:
[T]his is a war of attrition against an enemy with extensive resources. It is a long fight, one that never ends. You will never declare victory.
I can already hear the skeptics saying "It never ends, so you can keep paying Mandiant consulting fees!" or "It never ends, so you can keep upgrading security products!" You're wrong, but nothing I say will convince some of you. The fact of the matter is that until the threat is addressed at the nation-state to nation-state level, victim organizations will continue to remain victims. This is not a problem that is going to be solved by victims better defending themselves. The cost is simply too great to take a vulnerability-centric approach. We need a threat-centric approach, where those with the authority to apply pressure on the threat are allowed to do so, using a variety of instruments of national power. This is the unfortunate reality of the conflict in which we are now engaged.