The Cluetrain Manifesto
A strongly reasoned plea for corporate communicators to speak with a human voice.
http://www.cluetrain.com

International Association of Business Communicators.
A worldwide learning community for professionals committed to improving the effectiveness of organizations through strategic communication. Articles, conferences, career opportunities.
http://www.iabc.com

The Editorial Eye
Dozens of articles relevant to corporate editors and writers. Topics include today's usage dilemmas, style sheets, trademark controversies, web editing, estimating editorial jobs, and software.
http://www.eeicommunications.com/eye/

Ivy Sea Online
A wide range of free articles on communication within and from an organization. Organizational communication articles and tips.
http://www.ivysea.com/pages/a_and_t.html

360° Newsletter - Jack Morton Worldwide
Bimonthly newsletter about branding, marketing, and corporate communications.
http://www.jackmorton.com/360/frontpage/default.asp

Put It In Writing
Writing company business newsletters.
http://www.put-it-in-writing.com/

Melcrum
Global research and training for internal communicators.
http://www.melcrum.com/