I think I'll do NaNoWriMo this year. I normally don't bother because I write every day anyway. But I'd like to finish 2 more books by the end of the year, so NaNo may be what I need to get that done.
I don't participate in the whole "track my words per day" thing. I never have. It's enough that I write every day and I stay on track to get the book done by X day. I'm about 1/3 of the way done with a current manuscript, and I may set my goal as not November, but the end of the year for both books.
It's good to have goals. I work best with a deadline, so we'll see if it helps. I have a bunch of other events going on between now and the end of the year, and this might not be feasible, so wish me luck!