I've just recently discovered MyFitnessPal, an online weight loss/food journal/exercise website, and decided to register this morning. It reminds me a bit of FatSecret, but with a much better name (especially considering my interest in fitness and running)! :-) It has an iPhone/iTouch app that I've downloaded, but haven't started using yet.
I've signed up for several websites of this kind, and I keep looking for just the right fit to keep me motivated. It's interesting to see what's out there, for sure. Maybe MyFitnessPal will carry me through! If you happen to use MyFitnessPal, I'd love to know what you think about it, and whether or not it's worked for you. My "handle" there is lllooper.