Mine is called... unimaginatively "The Debates Site".
It allows multiple groups to exist, each with an admin who can assign registered users to his group.
The admin/registered users can post top-level posts, such as CD-info, Book-info, Essays, URL's, and then anyone (public) can reply (depending on group settings).
It's a cross between LiveJournal, Usenet, and a non-public bulletin board.
The system hides the existence of each group from one another because you can only view a group if you know it's name.
So it's invite only... but. It's expandable and very useful, and will be set so that it can be seamlessly included as part of an existing site.
It'll be finished next month, but will probably become useful to me personally much quicker, so you'll see previews this month. Maybe. I'm only coding it during lunch breaks!
It wont look as good at Makali's Republic (or have the voting systems), it wont be as user friendly and publically accessible as @stolath's UK Satanism board (www.satanism-uk.com), or as friendly/public Obsidian666 & Azozath's joint essay/board (www.decieved.co.uk).