Thanks to a pointer from a colleague who shall remain anonymous, in a message entitled "anonymity, privacy, blogging" (personal correspondence, January 12, 2006), I discovered a Borderland post On Anonymous Student Blogging, but not immediately.
There had been a fault in the link that I followed, so I skipped across to another post, Blogs and Genre, in which Doug refers to blogospheres (re-)defined by John Evans (Are There Three Blogospheres (Revisited)?). Between the two of them (among other commentators), blog genre definitions emerge that hinge as much upon audience definitions as upon content, if not more so.
It's going to take a while to explore all the ramifications of that serendipitous sidetrack. Hopefully further explorations along those lines will reveal gems to share or ideas to implement perhaps sooner rather than later in a workshop on Blogging for Beginners. In the mean time, this post may well serve as a stepping stone for anyone hopping by.