objective c learning Web sites

im beginning in Objective-C development and as i can see in the development blogs(about Objective-C) like w3schools.com we dont have such type of sutes to learn Objective开发者_Go百科-c language , can any one known the such type of Sites to Learn objective-c language .. please let me know--

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http://developer.apple.com/mac/library/documentation/Cocoa/Conceptual/ObjectiveC/Introduction/introObjectiveC.html

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http://cocoaheads.byu.edu/resources

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https://stackoverflow.com/questions/7571/cocoa-and-objective-c-resources

This has been asked before really.

EDIT: Even better, https://stackoverflow.com/search?q=objective-c+resources

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In addition to the above-listed resources, I've found a lot of good stuff on http://www.cocoadevcentral.com/

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I know this is a late reply, I've found a lot of interesting posts at www.buggyprogrammer.co.uk