The only question, is it for the better or for the worse? I don’t know; perhaps only time will tell.
UPDATE: An interview with Julian Assange from July, where he talks about why the world needs WikiLeaks.
UPDATE 2: This article in the Guardian makes an excellent point: if WikiLeaks can get ahold of this material so easily, certainly a foreign government can just as easily. These are not secrets from anyone but us, the American public.