What about the taped audio-messages from Osama Bin Laden? A lot of organizations say those were authentic. Bin Laden is a shrewd terrorist leader that easily could be a succesful CEO. He's not just a publicity whore. I think it's dangerous to assume bin Laden is dead. Always assume your enemy is alive, rational and doing the best in his abilities to kill you so as to keep you on your toes.
I think it's interesting that we've only heard AUDIO from OBL, and have seen no actual VIDEO footage of him for almost 3 years.
My conclusion: He's assumed room temperature. He's taking a dirt nap. He's worm food. He's gone slab surfing. He's doing the lawn limbo.