So far, I haven't gotten to much of the conclusionary stuff, but that doesn't interest me much anyway. (I like to read facts and draw my own conclusions.) It's just the extremely detailed account of everything that happened on September 11 that I find so interesting. Read the first chapter -- it's only about 40 pages. It details everything -- stuff that you wouldn't think they would know. It has detailed accounts about the passengers fighting back on American 11. It has transcripts of the calls between control towers and the FAA and the military. It's really riveting stuff--like I said, it's like reliving the whole event. I actually got physically ill yesterday reading it -- just from the emotional impact.
You can download the thing chapter by chapter at the link I posted above. For a general summary, check any news site. The basic gist of the report is that the US was totally and completely unprepared for the attack, and the incompetency stretched back through at least three administrations. Yes, errors were made in following emergency procedure, but it's highly doubtful that the procedures would have worked anyway.