I found this page and it has some excellent tips on catching up on NaNo. I'm still at 19000 words even though I should be at 33333 today, and while I know that chances are most people will have given up by the time they're this behind, in case you aren't, take a look at this page:
The bigger the issue, the smaller you write. Remember that. You don’t write about the horrors of war. No. You write about a kid’s burnt socks lying on the road. You pick the smallest manageable part of the big thing, and you work off the resonance. — Richard Price