Newsweek tells readers they're going to raise their standards on anonymous sources.
Newsweek's policy on attributing anonymous sources is not the problem here. The problem is Newsweek's policy on telling the truth once they've published false information from an anonymous source.
The source no longer deserves anonymity because they've lied. The story becomes the lie, and Newsweek owes readers the name of the person who lied and an explaination why.
Same goes for the Saddam pictures. Someone in DoD committed a crime selling pictures to the press and the press ought to name this person.