I love MyFitnessPal. I haven't actually lost any weight, but it helps me track my calorie intake. I love how even offline it is so useful and full of foods, workouts, etc. Very, very good app.

I used it for a few days, but I could never remember to input my meals.

I haven't but it sounds amazing! thanks for the post!

I LOVE MFP! I lost almost 20 pounds with it. It's great because it really gives you a good picture of how many calories you're putting in your body. It's surprising how quickly things add up. I don't use it daily anymore, but I keep it on my phone so I can look things up if I need to.