Scrivener is a neat Mac application (soon to be available for Windows) for writing long-form content. It’s designed with novels, screenplays and nonfiction works in mind. It helps you organize your notes (templates are included for things like character profiles) and assemble your manuscript.
The developer of Scrivener has a great deal for NaNoWriMo participants. You can download a fully-functioning trial of Scrivener 2.0 for Mac or a beta of the Windows version, and use it throughout NaNoWriMo. If you complete the full 50,000 word quota, you get a coupon for 50% off a Scrivener license. If you don’t manage to meet the goal, you can still get a 20% discount if you use a coupon code. It even comes preloaded with a NaNoWriMo novel template with the word count goal set to 50,000 words (and a tool to export a scrambled version of your novel for NaNoWriMo’s word count tool).
Scrivener NaNoWriMo 2010 Offer [Literature and Latte]