This is an excellent three-part series of videos of presentations made at the Stanford Rock Center on Corporate Governance, on the topic of shareholder activisn and how it has changed a lot in the last 15 years. The series provided a very up-to-date overview of proxy fights, PR wars and activist defense.
Shareholder Activism I
http://rockcenter.law.stanford.edu/2012/04/28/shareholder-activism/
Shareholder Activism II
http://rockcenter.law.stanford.edu/2012/05/14/shareholder-activism-ii/
Shareholder Activism III
http://rockcenter.law.stanford.edu/2012/05/14/shareholder-activism-iii/
The Board Director Training Institute (BDTI) is a "public interest" nonprofit in Japan dedicated to training about directorship, corporate governance, and related management techniques. It is certified by the Japanese government to conduct these activities as a regulated nonprofit. Read a summary about BDTI here, and see a menu of its services for both corporations and investors here.