http://www.prsa.org Official site of the leading U.S. professional PR organization
http://www.prssa.org Site of the Public Relations Student Society of America
http://www.prmuseum.com Website for NYC-based museum. Includes interesting histories on Edward Bernays and other important figures in PR history
http://www.odwyerpr.com Information about the field and statistics on numerous firms. Some parts require fee for access.
http://silveranvil.org Resource center and archive for case studies of award -winning PR campaigns.
http://www.prwatch.org Site of public interest organization dedicated to investigative reporting on the PR industry.
This is a collection of professional and academic journalism and mass communications online resources, including several of those listed above, maintained by the W&L library. There is a search engine which enables you to search the contents of most of these sites.