Just wanted to let you all know about the program I used last year when I wrote my first NaNoWriMo novel. It's called yWriter3 and has been developed by Spacejock. It's a FREE program so you can download a copy too! Very easy to use and I'm certainly going to be using it again this year!
While you are there to grab your program, be sure to enter to win a signed copy of a Hal Spacejock book! You can also find some articles on writing and publishing. Very neat site!