Momcastle Museum Ltd.
Though Momcastle Museum is fictitious, this simple little case is based on a true incident in the governance of a real heritage-based company.
www.boardsource.org/ (another heritage organisation)
http://governancefocus.blogspot.com/2007/08/governance-for-not-for-profits.html
http://law.fordham.edu/publications/articles/500flspub9371.pdf  (US case study)

The American Red Cross
This case emphasises a theme of the subject: that corporate governance is not just for listed companies, but that all corporate entities need governing. 
www.redcross.org [click on 'governance' at the top of the home page]
www.redcross.org.uk
www.ifrc.org

Network Rail
Wikipedia provides a useful summary of the current state of play in Network Rail and Railtrack: http://en.wikipedia.org/wiki/Main_Page
Network Rail Infrastructure accounts, with board reports, are available at: www.networkrail.co.uk/browseDirectory.aspx?dir=\Annual%20Report%20and%20Accounts&pageid=3221&root=
The home page www.networkrail.co.uk links to the company's strategic plans.

The Australian Securities Exchange (ASX)
This case is about the ASX decision, in 2006, to separate its regulatory responsibilities from its commercial function. Many other stock exchanges continue to run both activities under a single governance structure.
www.asx.com.au
See also the web pages for your local stock exchanges