I am switching my main platform from Windows to Mac and one thing I really want to learn how to do is Objective-C/Cocoa. With someone who already has good experience in C++ and C#, what training materials would you recommend? I am looking for something that does not go over the basic stuff in detail like what a variable is and what are control statements and stuff like that which I already know. Something that is geared towards people who already have a programming background would be great. I like video training the best but any recommendations would be great (Videos, books, online articles, etc...). Thanks.