It is the newest online iPhone SDK tutorial database offering FREE home-made tutorials made by people just like you who have a single goal as - to share as much information about developing for the iPhone SDK as possible. All tutorials are divided in three sections: Beginner, Intermediate and Advanced.
2) http://www.iphonesdkarticles.com/
This site includes tutorials regarding various different aspects of iphone application starting from first iphone application and then gradually explaining UITabbars, UINavigation bars, single and multi touch, using SQLite for saving data, localization of iphone application, etc.
Sometimes people have a hard time writing their first application. It is easy to think that it will take too much time, and that it will be too hard. But that is simply not the case. But instead of telling people, this site shows them how easy it really is. This site contains codes of 31 simple applications. Someone considering writing their first iPhone application should be able to look at these applications and "get it".