Signups open!
ETA: Yuletide Signups are now open until Nov 12. All you have to do to sign up is, find at least three fandoms off the massive list and put in your requests and offers. Doesn't matter if you nominated or not. Now go sign up! 
For more information about sign-ups, see
the FAQ and some extra posts
here and
here (optional background reading

). Basically you fill out
the form and list three or four requests for three or four fandoms you'd like to read a story in, and at least three fandoms for you to write in and have fun in. The hardest part is reading through
the ginormous list to find love! (Here's one fandom I know you know: Ace. Now find two or twenty more.

)
Watch out for browsers;
the form is huge, and may only work on
Firefox. If you still have trouble with the form, try asking someone; last year, I filled in a sign-up form with a friend's email and requests and offers she emailed me, on behalf of her because she had computer difficulties.
It would be lovely to see you in Yuletide.

Time for me to make another
Yuletide post!
Yuletide is a wonderful, end-of-year multifandom exchange focused on small and obscure fandoms (
FAQ). At the moment,
nominations are still open, so if you like the idea of participating, you can list six fandoms you would be interested in on that page--both fandoms from the
Giant Yuletide List and new obscure fandoms.
All you have to do when you sign up to the exchange is say which of the hundreds and hundreds of choices you're willing to write in, and when you're matched up with someone's requests, write one 1000 (or more)-word story for one of the fandoms on their list. There's two months to do it in and you'll get someone else writing a story to one of your own requests too.

Come and join me! Even if you don't feel like nominating any fandoms now, you can still sign up to participate later. Ace is likely to be on the list. ^^
This post has been edited by Sarah Frost on Nov 4 2009, 08:37 PM