I've got a Nano meeting/write-in at a local cafe in an hour and a half. Thankfully, I'm all caught up so anything I do beyond this point tonight will keep me ahead.
One tip I forgot to mention, and this may be obvious so forgive me if it is, but in order to keep the wordcount going, the best method I have found to just keep writing no matter what is to write scenes out of order. I always have at least 15-20 scenes (names, at least) written down and ready to start. If I am sitting idle at my computer screen or notebook for more than 60 seconds, I simply move on to the next scene, and so on. I never won Nano before I utilized this method. This can be effective whether you do plan an in-depth outline beforehand, or you just "wing it."