When I started searching the internet to learn about the iPhone app development, as always it happens there were plenty of information with a very simple problem - I didn't know where to start from.
As I was glancing though the URLs, I found one interesting blog post from Dale Dietrich @ "iPhone App Development - Where to Start?" The title itself, explains it all. Dale has put down very useful information for a beginner in this post.
So, if you are beginner and don't know where to start the iPhone app development, go right here :