Write an RPG in 24 hours, during November, in the Pocketmod format, without any numbers. Hard enough for you? Run as part of NaGaDeMon http://nagademon.com
I'm 2/3 the way through. By the end of December should be doable for me. Then we have a big chat in a SUPER SECRET MOD FORUM where we argue for our favourites. Sometimes one just sits on top and we all say "OMG WHAT HAVE I JUST READ" (Droog Family Songbook) but I think there might be a fight this year.