Groups - http://sun.science.wayne.edu/~wpoff/groups.html Hypertext teaching model covering attitudes, social influence, and group dynamics.
Working Psychology: Introduction to Influence - http://www.workingpsychology.com/ Overview of the science of persuasion, compliance, marketing, propaganda, and "brainwashing" from a psychological perspective, together with a discussion of ethics surrounding these issues.
Primer of Practical Persuasion and Influence - http://www.as.wvu.edu/~sbb/comm221/primer.htm Online coursebook by Steven Booth-Butterfield, for his course in Persuasion Theory and Research at West Virginia University.
Social Influence Theories - http://oregonstate.edu/instruct/comm321/gwalker/influence.htm Lecture notes covering cognitive dissonance theory, social influence, social judgment, the elaboration likelihood model, and the theory of reasoned action. No onward links.