I’d think that the question is not one of “right” but of “expectation.” Given the nature of the ‘Net, to expect to remain anonymous as a blogger is a mug’s game, no matter what one’s right to anonymity might be.

I occupy something of a middle ground as regards how much to reveal of myself. I put the URL for my blog on my course syllabi, but I don’t otherwise draw attention to it at school. Speaking for myself, my privacy is worth less to me than that of my children, and so I’ve used only their first initials when referring to them. Even so, someone who can barely fog up chilled glass could probably figure out who they are without too much trouble; though I’d rather that not be the case, there’s not a lot I can do about that so long as I choose to mention my children, no matter how obliquely.