An excellent overview of the field by one of its founders, Terry Bynum.

A corresponding article on the moral responsibility of computing professionals

Ed Gehringer's site on many computing ethics topics

The Online Ethics Center has lots of content and many short cases and biographies.

There are some detailed cases at the Engineering Ethics web site at Texas A & M..

Computer Professionals for Social Responsibility have a content rich site.

Simon Rogerson's Centre for Computing and Social Responsibilty has an online journal and many other items.

Bill Frey and Jose Cruz have created many excellent classroom exercises that use computingcases.org material.