You may think you have seen all there is to see on the September 11, 2001 attacks in the United States. But if you have not yet seen the one linked below, it will be well worth your time - if not your responsibility - to take one hour and twenty four minutes to watch 9/11 Press For Truth
This could be the best and most credible study of September 11th 2001 anywhere. Paul Thompson's Complete 9/11 Timeline provides the research for this documentary.