From the comments at Think Progress:
Questions remain unanswered. Here are a few that are disconcertingly dismissed as “nonsense conspiracy theories.”That's just for starters, of course. And while we are doing it, let's re-examine why Cheney and others cherry-picked intelligence on Saddam's WMDs.
1 - How is it that WTC 7, a 47 story building that wasn’t hit by a plane on 9/11, collapsed from fire alone? This defies the basic principles of science. No steel frame structure has ever collapsed from fire alone.
2 - Why did FEMA and the 9/11 Commission leave out WTC from their investigation? I am sure insurance companies would love to know why it happened. I am sure aspiring architectural engineers whould know as well.
3 - Why was all the steel from WTC shipped off to China, even before the investigation was opened? This could be considered the greatest tampering (or destruction) of evidence in the history of forensics. What were they hiding?
4 - Why didn’t the SEC investigate the tremendous spike in put-options for airline companies that took place in the days prior to 9/11? Isn’t this clearly a red-flag that someone had foreknowledge? Why not investigate those who profitted from this info?
5 - Why was the Bush administration so opposed to an investigation into 9/11 to begin with? Why wasn’t he or Cheney called to testify? If this was a company, you know the CEO would have been questioned by the authorities.
6 - How is it that no one has been fired for the gross security failures and negligence of the 9/11 attacks? The only one who admitted any fault was Richard Clarke. Read his book - it says a lot.
7 - Why isn’t Osama bin Laden listed as wanted for 9/11 on the FBI website? He is only wanted for the embassy attacks of 1998. Who is responsible for these attcks?
8 - Why did Ashcroft start to fly on private charters in the weeks leading up to 9/11? Who was it that gave San Francisco Mayor Brown the warning not to fly before 9/11? What are the roots of these warnings? Who knew what and when? Why was that omitted from the investigation?