iPhone Open Source Members Only Appliaction

iPhone Open Source Members Only Appliaction I am trying to find a skeleton framework that creates an authenticated environments that has all the standard stuff like user profiles, the ability to update those profiles. I am just looking for a starting point and I will build the rest of the functionality into the app. I am a php mysql guy so an app that is driven by external data sources would be great. Any thoughts, ideas or nudges in the right direction would be very much appreciated. Please let me know if you need more information. Thanks!