Has anyone done this? Heard of this? I think the forums open in October.
http://www.nanowrimo.org/
Its not fanfiction, its an annual writing challenge where for the month of November only, you have to try and write a novel - anything you like, 50,000 words long. I think they pick winners and stuff and theres a chance to read people's finished entries. I'd not heard of it until early this year, but I think I might give it a go.