What's the best resource to learn how to write apps for Mac OS X?

Question

I'd like to learn how to write application for Mac OS X.

Like how to use XCode properly, Cocoa syntaxes and examples, etc.

I'm already a web developer using ruby, php, mysql, rails, etc.

I looked through google quite some times but never found something palpable to learn from.

But I really want to make my own application, for fun and maybe business later.

Thanks a whole bunch for your tips!

Answer 1

Aaron Hillegass's book "Cocoa Programming for Mac OS X" is certainly up there. It would also be well worth your time to learn the C language well.