There's a thread in General Discussion where someone questions the authenticity of the "Osama Confession Video."
http://www.democraticunderground.com/10021587491
Some point to this picture taken from the video of Osama's conversation about his foreknowledge of 9-11:
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That looks fat for Osama. I haven't seen any frame in the "Confession Video" where Osama looks like that. I think there are other versions of the video where Osama may look fat. Here's some evidence that the video is genuine.
They may have used a cheap subtitle editing program on the video that seems to have created a variable appearing Osama in the "Confession Video." That may be what altered the aspect ratio. But there seems to be different copies with some videos showing Osama particularly fat in parts. There are also scenes in the better videos where Osama looks perfectly like himself.
It seems to have been, at the minimum, a deliberate attempt to mislead by choosing the worst moment in the video where Osama looks the least like himself.
From same video, compared with known Osama pictures:
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That sure looks like Osama to me, and he talks about his foreknowledge of 9-11 in the video.
More info here:
http://www.911myths.com/index.php/Confession_video