A friend of mine sent me this site My Fitness Pal
It is the best site I have found as far as ease of use, and cost --- FREE!!!
When you input your food, at the end of the day you hit "complete this entry" and then it shows "If every date were like today you'd weigh ____ lbs in 5 weeks"
So it really helps you know if you are on the right track or not. If you have an android phone there is also a free app so you don't have to be tied to your computer to add food and exercise.
Of course just tracking your food in any manner is big help. Lots of studies even prove it! I know that I have got back on track with this, I really think about what I eat!