I wrote a couple of Nanowrimo "Survival Guide" type posts on my blog awhile back, I think. Part I and Part II. I've been participating in Nano since 2002 (wow, I feel old) and the thing I can tell you is take care of yourself. Seriously, Nano is about going crazy and writing an insane amount of stuff, but don't risk your health! Baby yourself, and keep records. They have scorecards that'll help you (or hinder you, if you're feeling you're not living up to your standards). By the end of the month, I'm always glad that I kept with a scorecard.

And of course I will be here to cheer you on. If you have gchat, I'm right2befrea (at) gmail and am always willing to engage in a word war!

Good luck!!!