A classic blogger, in and of itself, is a simple enough app that there are probably a number of acceptable code bases from which it could be built--Lars' blogger, ETP, maybe Jerry's code, etc. I think it's important to identify what new features might be necessary for a learning environment before a code base can be chosen.
What's becoming clearer in my own mind is that, in an educational context, we're always talking about conversations. On bboard, we're used to a more or less egalitarian conversation. Moderated bboard puts a bit more control into the hands of one discussion leader, but is still fairly egalitarian. A blog-like app with built-in bboard-like commenting features moves further in the direction of putting the moderator in control.
Ideally, we would have one tool for various kinds of educational conversations that would enable (and perhaps even guide) instructors to make particular fine-grained choices about the preference settings for a particular conversation (or package instance, to think of it from the code perspective) depending on their particular educational goals.
