As you may be aware the best way to learn something is through discussions and by knowing others opinions. Online forums provide a good way to do this. Sometime back, I came across a forum on Apple iPhone SDK. I was impressed with it.

This forum contains many subsections on SDK programming, iPhone SDK, iPhone accessories, iPhone 2.0 and many other topics. There are a good number of posts and threads and it is quite informative as well.

If you are a iPhone user or a coder who wishes to develop applications for the iPhone, register yourself at the forum. I believe that it will be a good learning experience for you.