A thought and a comment.... or two....
The thought. How hard would it be to have the same sort of word verification system in place for each new post that is now in place for each new comment? Perhaps also for the whole site republish? That way there'd have to be a literate human involved, right?
The comment. (whose side are you on?) the "Make Poverty History" corner tag that some folks use on their blog disables both the "next blog" button and the "flag" button.
I read on blogger help & elsewhere that the "flag" button is intended for objectionable content, rather than for splogs.... oh, well....