I actually started doing this last year with a blog (take picture, send to blog) and while it did help get a handle on what I was eating (mostly stuff like 'wow, there are really no vegetables in there') I stopped doing it after a while - partly because it feels pretty weird and anti-social to be taking pictures of your food when eating with other people, especially when out at a nice restaurant, or when someone else has cooked dinner for you.

I actually just started this again the other day - I don't think the app would make it any easier for me, but it's a nice reminder/validation of the practice :)