I really try not to endorse products too much, however I have to give props to those that have really worked for me.
Earlier this year (2009) I was looking for an iPhone app to help me track calories and the food I consume, as I had read that doing this can make a big difference in achieving weight loss goals. So I stumbled across "Lose it!" and have been rocking and rolling ever since. Adding it into my diet and exercise routine has made a world of difference. Best of all it is extremely easy to use. I highly recommend it.
All that said, my point here is that they just released a much needed update that allows users to create an online profile and back their data up to the website. Additionally they have added in community features so that you and your friends can provide encouragement to one another. I highly applaud the online backup and additional reporting capabilities.
This is a great product and if you need help watching your calories, give this a look. Check them out: www.loseit.com