No doubt.
But I don't think Dubya was in on it.
If there was an as yet uncovered conspiracy, my guess would be that the most likely conspirators were The Mossad, in cahoots with Cheney and Rumsfield and their homies.
There are some compelling pieces of evidence. Like the actual film footage of the sections of wall exploding in sequence at the base of the building, the numerous first hand witness reports of explosions in the basement prior to the plane impact, the fact that the footage of the plane striking the building shows it exploding before you the wings have gone through the wall - the fuel is in the wings, not the cockpit.
The weirdest detail IMO is that there was a simulated attack being run simultaneously as an 'exercise' - and this also happened in the subsequent London bombing. Seriously, what are the odds ?
Possibly the strangest thing was that the Carlyle Group were meeting at the time, and the Bin Ladens were present. Way weird timing.
And a few other weird details, like the POTUS - Commander in Chief- was left unprotected 15 kilometers from an airfield, with a publicly known itinerary, while his country was under attack from civilian aircraft, and he wasn't rushed to a safe place, which is the first thing his minders should have done.
And then there were the 200 Israeli spies arrested in the following week and subsequently never mentioned.
And a few other weird details.