Wikipedia's entries on Al-Qaeda and the September 11 Attacks are clearly biased toward the "official conspiracy theory". And what's very telling is that these entries are not subject to Wikipedia's normal flagging for controversial or contested material - it's all just official theory with virtually no indication of alternative viewpoints. The entries are locked: "This article is semi-protected indefinitely in response to an ongoing high risk of vandalism."
Hey Wikipedia, you need to watch Part 2 of Zeitgeist, The Movie.
View it here: