Cheng-Chih Wang's Research: Research papers and course syllabi covering the subjects of crisis communication, media study, genocide, and sociology.
Claes de Vreese: Resource for teaching and research on political communication, public opinion, media effects, campaigns, and media and politics.
Communications Central: Links to resources and definitions related primarily to semiotics, interpersonal communication, organizational communication, health communication, and nonverbal communication. From Governor's State University.
Happy Fun Communication Land: Tutorials, study questions, glossary, and citations facilitate secondary or undergraduate learning about communication theory. Whole site is searchable.
Melcrum: Articles on aspects of communication in corporations, including public relations, measurement and change management.
Mick's Communication, Cultural and Media Studies: Extensive list of interlinked definitions of concepts related to cultural studies and media ecology.
Reaching Out: The Evolution of Communication: Interactive educational site discusses changes in communication technology, from hieroglyphics to the printing press to the Web.
Text-e.org: The impact of new technologies on reading, writing, scientific communication and publishing. Features ten target-papers and discussions [in english, french and italian].