Who knows??? But when I hear a clear "tape" of Bush like this one:
http://downloads.warprecords.com/bushwhacked2.mp3
( it is old, but to the point)
I have to admit that it is easy to fabricate evidence ( unless this Bush speech is true... lol).
Bin Laden tape's are surfacing at a very convenient time, in a climate of terror sustained by the US & Britain ( both and only countries with "orange" or High Terror Alert).
I think that Bin Laden has always comunicated with video, and if he wanted to show that he is alive, he would of done so.
Now, is only the US able to do these types of operation: NO
At least one other countrie is capable and motivated to do so.
On this, let's keep our option open: they could be true, maybe they are not.