Here's the blurb from the NaNoWriMo web site:
National Novel Writing Month is a fun, seat-of-your-pants approach to novel writing. Participants begin writing November 1. The goal is to write a 175-page (50,000-word) novel by midnight, November 30.
What a hoot! Check out their web site for more information. I dare you to take part! Double dare you. I'll be giving it a go.