Here is the the most compelling 911 video that builds a case, point by point, that can actually stand up in court. It wisely avoids discussions of physical evidence (which merely pits one technical expert against another) and instead builds its case purely around verified government statements, documents and press releases already on the public record.
Only things is, you actually have to buy this one as it is not online. But it's worth it:
http://fromthewilderness.com/store/videos.shtml#truth