I find two things make this article worth reading: they correlated the exact location of the victims/survivors, job type, prior experience, etc. and came up with a fascinating picture of what made people decide to do one thing and live vs. something else and die.
The other thing is that what actually unfolded in the Towers on 9/11 turns a lot of cool analysis on its head. I tend to analyze and be indecisive, and I almost certainly would be dead. The instinct to flee saved a lot of lives, while others who try to be "cool under fire" ended up in little vials.
Other than that, look at the very last story about the guy who "went out to take a look" and was the only person in the meeting to live. Its a sober reminder to make your peace with God, because you never know what the next hour will bring.