yay Yuletide!
I never sign up because I'm terrible with commitment and obligation. I usually just go through the prompts+letters and write for whichever I want, then submit it under Treats, like
this BTTF fic last year, which is one of my favourite things I've written. :D
'tis more fun that way. plus there are always lots of great stories to read, so I don't feel like I'm missing out on that side of it.
Also wow, NaNoWriMo is coming up soon.