Quickly, though, from the site you link to:
Do you remember the chaos around the tube bombings? how speculation about the number of bombs went on well after the events themselves? News agencies recieve conflicting official reports as the bigger picture becomes clear, eyewitnesses get it wrong (I particularly remember an American tourist saying 'yeah, it was one of them big reds' on july 7th, which had the BBC convinced for half the day that it was a tourist bus). This website is basing its entire analysis on discrepancies that will arise in any situation. There is no proof in there whatsoever, no eyewitness accounts of two planes, no photographs, nothing from air traffic control or ground staff (or do you think you can land a 757 in the middle of a fucking airport without coordinating with it?).
I know this will make absolutely no difference to your opinion of course...