The article that I've posted sums up a good cross-section of the inconsitencies in the official explanation of events but it is still just the proverbial tip of the iceberg; with possibilities ranging from the probable to more outre.
The web-site: Scholars for 9/11 Truth Digs even deeper into the various unresolved aspects of the historic, pivotal events that occured that day.
The biggest problem is of course, convincing others that this is a possibility. Having studied history and proven conspiracies such as MK Ultra; I would daresay that I see the events on 9/11 as being comparable to a repeat performance by a serial killer. The Motive and methodology used resemble one another to a chilling extent. However, the public only seems capable of accepting proven conspiracies in the context of the past; where they can be ignored and safetly glossed over. The possibility of modern conspiracies by those in power against the American people no doubt frightens the average person so much that they cannot rationalize it and leaves others in the prevailing outlook, that of apathy over a situation that admitedly seems irresolvable.