I'm astounded at how casually people here are taking this - even taking Assange's side. Sure, governments may be doing some unethical things; undoubtedly they are. But exposing it all can only cause things to blow up that might otherwise have been handled more diplomatically.
Real-world people *will* die as a result of his site. Real-world wars may even be fought. And governments aren't going to change anything anyway, except perhaps try harder to keep leaks from happening. So everything Assange calls "collateral damage" is really just fodder for his ego trip.