Regarding the insipid Salon nonsense, do you really believe the correct criteria for investigating a savage terrorist attack is money? And while we're at it, just what did the Warren commission accomplish? It's forty-years since JFK was assassinated, and there's still a zillion conspiracy theories out there (and as many websites). Money well spent clearing that up, right?
The Pearl Harbor commission's findings are thought by many to have created scapegoats of Army and Navy personnel in order to appease the public.
And lumping the Columbia investigation with the JFK assassination and Pearl Harbor is ludicrous (it's the only one in the outcome is mentioned, by the way). There was no conspiracy or foreign power involved in the Columbia disaster; it was a forensic investigation -- no comparison to the other incidents.
Finally, 9/11 was a conspiracy with tentacles spanning the globe. We already know much about the actions, motivation and funding of the terrorists, and anyone with half a brain knows that we were vulnerable due to decades of turning the other cheek to Islamic terrorism.