WriSoMiFu's goals are a little less...ambitious than NaNo. Instead of smacking out at least 50k words in a month, the WriSo goal is to write for at least ten minutes a day.
Yep, ten minutes. We all can do that, right? And then the best part is that you can bitch and moan about it as much as you like in the comments of the daily check-in posts. You get misery; you get company; you get productivity, what's not to love?
I love it, personally. It's fun and supportive, and I've met some really cool LJ friends via WriSo, too. So head on over to fitofpique's Live Journal and sign up. Seriously. All the cool kids are doing it.