I've failed at two NaNoWriMos so far . I think I'm going use this year's to supercharge a novel I started at last year's NaNoWriMo, and have been continuing ever since. Probably won't submit anything though.
I've found that inspiration comes in the weirdest places, and some of my best writing has happened when I'm waiting for a friend at a bar or something. So I pull out iPhone Evernote, create a new note with a simple title and bang out some paragraphs, take a snap of something if it was external inspiration. It's really more about churning out that content wherever inspiration hits.
I like the idea of using it to build character profiles. You could even take pictures of places where you think they would live, or what they may look like, and build those into the profile note. I'm really into the writer's theory that if you can build a real and thorough enough set of characters, the story will more or less write itself once you give them some circumstances to wade through.
EDIT: Probably should add the website of NaNoWriMo so this makes sense: http://www.nanowrimo.org/