iOS Dev Channel

Tips, Libs and more on iPhone and iPad development
by Vincent Demay

Nice iOS Objective-C stuff, tips & triks
by Sébastien HOUZÉ

iOS Development
by Domsware

Great resources and news on iOS & Android development
by Greg

Here you can find interesting topics on iPhone/iPad development !
by Jean-Philip Eimecke

All the videos & tutorial on iOS
by anandram venkataswamy

great third party developments for ios
by Seb

Objective-C is the only main programming language for developing Mac OS X or IOS applications. Many new programmers to Objective-C do not realize that Objective-C is actually a superset of the C programming. Also the Cocoa frameworks and Xcode itself is written in C, not Objective-C. This tutorial is a first in a series to help programmers the basic of the C programming language in respect to Objective-C. To really know and understand Objective-C, you need to first learn C.
by Kevin Languedoc

iPhone, iPad, and iOS device
by Tsuzumi Aoyama

iOS/OSx source on github
by Kok Lite