It seems like most of the ideas that people have abour PR are negative. People think that we spin information or make things up or just cover up mistakes that have been made. While Im sure this has been true at some point, not all PR Practitioners are unethical. Here are a couple sights with related topics that you might find interesting.
http://www.blogherald.com/2007/03/23/are-public-relations-practitioners-spamming-the-media/