Putting aside the Werewolf craze for a moment, I can say with confidence that the thread that has interested me the most this year has been the
Assigned To Mordor RPG.
I'm not sure if anything like it has been done before, as I've never RPGed before, but I think it's a bit of a deviation from the norm. And, of course, hilarious reading at every turn.
Alright. Now I'll mention Werewolf.