On the day of commemoration and mourning for thousands of lost lives --I wonder how many will remember John O'Neill.  And I wonder if among all the stories that will be told over the years to come, his will be lost and forgotten by all except those who believe that without the truth, there can never be true healing. 

 The Looming Tower by Lawrence Wright is worth reading for big picture overview of events leading up to attack...and much is available online from hundreds of sources which one must take with grain of "Web" salt.  However, another compelling and (one assumes) credible source is:

 PBS FRONTLINE DOCUMENTARY 

The Man Who Knew

http://www.pbs.org/wgbh/pages/frontline/shows/knew/view/