FitDay.com
FitDay.com is a free webservice where you can enter what you eat in the day, what exercise you do, etc, and it will help keep track for you of the various nutrients your getting, help you see through graphs where your calories are coming from such as fats, protiens, carbs. It will also allow you to personalize your goals so that you can keep track of where you are in meeting those goals.
I find it handy.