Nanowrimo is a challenge taken in November to write 50, 000 words. I've been doing it for five years and anyone who wants to do Nanowrimo on this site can talk about it here (because we're obsessive like that.)
The URL is at the top of the home page and is:
www.nanowrimo.orgIt's a great site and challenge, oh, and one warning-I won't be around pretty much at all during it because I'm writing 250, 000 words this year.
If you're going to participate, post here!