Have you ever done NaNoWriMo?? (That would be National Novel Writing Month for the uninitiated.) It's where you commit to write a 50,000 word novel in 30 days during the month of November! You can find out more at their website here.
To be honest I'd forgotten that I said I was going to do NaNo this year until a few days ago! Whew! Time for that epic month of exhaustion and frenzied typing!
So what are you waiting for?? Get writing!