AdWeek
Adweek is a magazine and website that covers media news, including print, technology, advertising, branding and television.
http://www.adweek.comCopyblogger
Content marketing tools, tips, and training for online marketers, copywriters, and entrepreneurs. The advice, strategies, and solutions that work.
http://www.copyblogger.comAdvertisingAge
Ad Age is the leading global source of news, intelligence and conversation for marketing and media communities
http://www.adage.comSeth Godin
Seth Godin's riffs on marketing, respect, and the ways ideas spread.
http://sethgodin.typepad.com