Check on CNN.com for a clip of it. I haven't had the chance to watch it, but some of the excerpts of Bin Laden are chilling:

Bin Laden, at one point, explains: "We calculated in advance the number of casualties from the enemy who would be killed based on the position of the tower. We calculated that the floors that would be hit would be three or four floors. I was the most optimistic of all.

"Due to my experience in this field, I was thinking that the fire from the gas in the plane would melt the iron structure of the building and collapse the area where the plane hit and all the floors above it only. This is all that we had hoped for," bin Laden says.

I don't see how anyone can doubt Bin Laden was responsible for the WTC attacks after this.