Michelle, You might want to check out sparkpeople.com I have had great success with the online food diary. It keeps track of your calories, fat, protein, etc. I thought I was doing a good job of self monitoring, but really wasn't. There is also a water intake measurement. There is a workout calculator that totals how many calories were burned during your workout. I need to use that page more than I do!
I find that if I have to write everything down, I don't eat what I know I shouldn't. This was a really bad weekend! Saturday I ate out all 3 meals! I'm scared to enter it because I know it was a million calorie day! LOL
In 3 weeks I've lost almost 10 pounds, really just by monitoring my foods. Lots of fresh vegetables and low-carb items. I think it was Alyssa that mentioned you need at least 1200 calories to lose weight. I'm in a 1200-1500 range.