NaNoWriMo offers some cool Word Count widgets for keeping a check on your running total. If you haven't already signed up at the official site, it's not too late. Here's mine:
You can even have a "Word War" with another user:
Then this guy has made some even cooler widgets, one of which predicts when you're likely to finish your novel, and lets you use your own logo:
The only thing you have to do to keep it updated is go to your NaNoWriMo novel page and keep your current total updated. If anyone sets themselves up with these icons, we can put them in the sidebar of the blog.