In C++ community, "Effective C++" is very famous for its concise, in-depth and practical style. For Objective-C, most of the books in the market is primer introduction to the language. Is there a book for Objective-C like "Effective C++" for C++?
BTW, I found this document is very valuable for a programmer from C++ to Objective-C: http://chachatelier.fr/programmation/fichiers/cpp-objc-en.pdf