The following sites may be of interest if you participate in the advertising and public relations industry or if you would like to learn more about the world of advertising, design, or marketing:

Advertising Age
Advertising Research Foundation
American Advertising Foundation
American Association of Advertising Agencies
American Demographics
American Marketing Association
Audit Bureau of Circulations
B2B Magazine
Business Marketing Association
Business of Performing Audits (BPA International)
Center for Exhibition Industry Research
The Cluetrain Manifesto
Communication Arts
Forrester Research
Direct Marketing Association
Graphic Design
The Standard
Jupiter
Marketing News Online
Media Week
Nielsen Media Research
Print
Public Relations Society of America
SRDS®
Trade Show Week Online
World Advertising Research Center