I do believe that the dead Osama Bin Laden picture is really showing a dead Osama. Watch especially the chin and mouth area. If that was a double or something, they really put some serious skills into that.
Else, nice job Obama!

Update: As always, believing is not knowing =)
Just came across the original pics that have been used to ps this hoax photo and @peterjames2009 just submitted the assets.

http://www.liveleak.com/view?i=585_1304330254