Happy Fun Communication Land Tutorials, study questions, glossary, and citations facilitate secondary or undergraduate learning about communication theory. Whole site is searchable.
Claes de Vreese Resource for teaching and research on political communication, public opinion, media effects, campaigns, and media and politics.
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].
Melcrum Articles on aspects of communication in corporations, including public relations, measurement and change management.