As long as I have practised professional public relations I have been a
member of the Chartered Institute of Public Relations and have always
abided by its
Professional Code of Conduct (can't provide a direct link as the CIPR site uses frames).
Neville Hobson has an interesting
post on the International Association of Business Communicators code of conduct which mirrors much of what is in the CIPR code.
It is important that as professional communicators we continue to
highlight the fact that we are bound by such codes, because too many
people still prefer to believe the often negative media coverage about
our profession.