Osama - so what.
Osama bin Laden and an aide.
Osama alive? Crying "Uncle"? So what. Guy isn't really relevant much anymore. He's almost a liability to his own side, as he sure doesn't look much like the "strong horse" he used to rattle on about. Don't get me wrong, I want him to get what he deserves - death. But he isn't as relevant to the current fight as say, Zawahiri or Zarqawi, or even Mullah Omar in Afghanistan/Pakistan.
Also, I don't care how much his voice is "authenticated" - I still think he is Purina Vulture Chow somewhere in the Hindu Kush. He would have been bombarding the world with videos saying "Ha, ha, you missed me, Crusader!" At least something a bit more specific than the generic stuff he has allegedly been putting out.