NPR Coverage of the story can be seen here.
Fox News Channel's coverage of the story can be seen here.
The New York Times coverage of the story can be seen here.
The NPR Code of Ethics does appear to cover the behavior and comments NPR journalists can make when they appear in outside speaking engagements, though we can guess that Juan Williams did get permission to appear on the show from NPR, as required by the code. However, should codes of ethics regulate what a journalist can say when he is not "on the job"? How far should an ethics code govern the behavior of the employees of a business or a profession?