yuletide is starting the nomination process for what fandoms will be available this year. If you're planning to write for yuletide, I'd strongly suggest, joining the community NOW, so you can be part of the process. Even if you're not sure you'll be able to make the commitment, you might want to get involved anyway, so that when the stories come out, there's a better chance of seeing something you'll want to read.
yuletide for the general community
yuletide_admin to be in on all the planning and news.
Come on, at least take a peek! You know you want to. :)