Two articles over on Slate analyze and parse the new Congressional report on how our intelligence system failed to anticipate the 9/11 tragedies. The report runs 900 pages (some of them, redacted) and since you're not going to read it, you might want to read Fred Kaplan and Timothy Noah. The bottom line seems to be that there were a few screw-ups in the past and that appallingly little has been done to improve the situation.