This year, I've decided not to take part. There's a few different reasons. Primarily it's because I don't have a clear idea for a novel at the moment, and I've not had enough time during October to try to figure one out. There's also the fact that doing it in November last year gave me nothing like enough time or energy to get anything at all sorted for Christmas.
So. It's a bit of a shame, but the next time I do a NaNo, I want to have the idea and plot mapped out nicely in advance, because I believe that's the key to getting a half-decent start of a novel out of the month.
What I will do this month, though, while all the energy and buzz is flying about from the people who are doing it, is give some serious thought to the theme and plot of whatever my next madcap attempt at doing this will be. I've got a week off to myself (for the purposes of recovery from hideous job) later this month, and I'll have a think about it then.
And of course, you don't have to do it in November. It gives you lots of company, and there's support from the website and the podcast and whatnot, but fundamentally, you can just pick a month and get going -- the important thing is the deadline. So I won't necessarily have to wait until next November if a good enough idea comes along...