Nick Reynolds talks about corporate blogging at the BBC in this article for FUMSI. It could be a starting point for talking about confidentiality and ethical issues to do with blogging, or about blogging as public relations.
Reynolds, N. (2008) Corporate blogging:how to be open. FUMSI, September. http://web.fumsi.com/go/article/share/3199
Photo by Sheila Webber: photoshopped tree, Western Park, Sheffield, September 2008