While taking a break from work yesterday, I created a word tracking template for NaNoWriMo. It's a really simple Excel template, enhanced with some basic logic statements. This lets me make goals for each day during the challenge (I made different goals depending on what's going on in my life on a particular day) and make sure I'm on track, and even gives me words of encouragement for different word count milestones.
In case this template sounds useful to you, I've added it as a shared file in my Dropbox. Find it here. The document includes the template plus a second sheet explaining how everything works. Enjoy!