What's the best way to track my calories?

I use software called DietPower (www.dietpower.com) when I want to track my own calories. Keep in mind that various software or sources will vary by up to 50% on calories for a given item.

Some people use this as cause for stress. Personally, I have found it is less important to worry about those variations and more important to pick one method and stick with it - i.e. consistency is key, as the differences will come out in the wash.