NaNoWriMo

http://www.nanowrimo.org/

November is National Novel Writing Month. The goal for aspiring writers is to write a 50,000 word novel (about 175 pages) starting no earlier than November 1 and finishing before November 31.
By signing up at the National Novel Writing Month website (also known as NaNoWriMo), you can create a profile and access the participant forums, where you can finds tips, hints and helpful encouragement. You can post excerpts of your novel for others to read. When you are ready, you can submit your novel for an official word count, which is "read" by a computer. If you succeed, you get a certificate and the satisfaction in having finished a novel.
According to NaNoWriMo, the key to success is to worry less about the quality and more about quantity. The brute force method must work, because every year more and more people finish as "winners".

http://www.nanowrimo.org/eng/basics