I desire to improve my knowledge base on the inner workings of the operating system, etc.

I love to read different post here on this site, as well as the iPhone dev-team blog and other sites, and want to know how it is that some of you guys gained the knowledge that you have.

I know this is a pretty broad question, but what might be the best path to improve my skill in the arena of Mac development? Learning C++ or objective C efficiently? Studying the Mac training materials for the OS? Studying and gaining proficiency in UNIX? All of the above, or are there other methods that helped you gain the knowledge that you have to develop in the Mac and iPhone arena?

Thank you in advance - I appreciate the direction.

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