Here are two free ways to learn to design & develop for iOS devices like iPad, iPhone & iPod Touch.
I know you definitely know Apple’s Website but there is one website dedicated to developers only called developer.apple.com
As you may know Apple has ‘World Wide Developer Conference’ i.e. WWDC every year dedicated only to Developers on Apple Platform. Lucky thing is that Apple releases it’s WWDC keynote & learning session videos on web through their own developer site which is mentioned above.
To access those videos you have to have ‘Apple ID’.
That means you have to register on ‘Apple Developer Website’.
Videos are available on web to view or You can download it to your iTunes application.

Here is iPhone Development videos on iTunes
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