I discovered fitday.com two years ago.
I first used it to track portions and calories, then I started paying attention to protein and fat intake. Now, I also pay attention to nutrients . . . sodium, zinc, potassium, etc.
When I am losing weight, it's usually because my calorie intake is around what is listed as my BMR.
Lots of fun sidebars that allow you to do extra things like input your goal weight and goal date, journal entries, etc. These I usually forget about because my time is limited.