Ressources for OSX-from-IOS-developers [duplicate]

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Possible Duplicate:开发者_StackOverflow中文版

Tips for an iOS developer to learn Mac programming?

After having spent a year in IOS-development, I'd like to broaden my horizon and jump into OSX-development. Does anyone have a good ressource, book, online or otherwise? I'm looking for: 'the differneces in short and fast are', instead of 'first, download xcode'. Any tipps appreciated!

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I advice to use learning resources from http://developer.apple.com

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This is the standard for learning Cocoa on Mac OSX. I went through it and found it to be very good:

http://www.bignerdranch.com/book/cocoa_programming_for_mac_os_x_rd_edition_

Also, this book was good but felt more like a reference and less like a tutorial which the previous book was:

http://www.amazon.com/Cocoa-Programming-Developers-Handbook-Chisnall/dp/0321639634/ref=sr_1_3?ie=UTF8&qid=1316367686&sr=8-3

After those, this advanced book is good:

http://www.bignerdranch.com/book/advanced_mac_os_x_programming_rd_edition_

I also recommend the WWDC videos if you pay for the dev program. Good hands on practical advice and walk throughs on good topics.