Sibel Edmonds a former FBI translater and whisleblower asks The 9/11 Commission:

Your commission, the National Commission on Terrorist Attacks upon the United States, was created by law to investigate "facts and circumstances related to the terrorist attacks of September 11, 2001" and to "provide recommendations to safeguard against future acts of terrorism", and has now issued its "9/11 Commission Report". You are now asking us to pledge our support for this report, its recommendations, and implementation of these recommendations, with our trust and backing, our tax money, our security, and our lives. Unfortunately, I find your report seriously flawed in its failure to address serious intelligence issues that I am aware of, which have been confirmed, and which as a witness to the commission, I made you aware of. Thus, I must assume that other serious issues that I am not aware of were in the same manner omitted from your report. These omissions cast doubt on the validity of your report and therefore on its conclusions and recommendations

http://www.truthout.org/docs_04/080304W.shtml