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Mike Ash's articles are the most in-depth I've seen.

Yikes, that index page is incredibly hard to read, the actual content pages are much easier to read though. Looks like a solid resource, thanks.

It's worth it to go through the archives of Friday Q&A on Mike Ash's site.

There's also iOS Dev Weekly (http://iosdevweekly.com/) a curated newsletter with links to happenings in the iOS space.

http://macdevelopertips.com often has some crossover as well.

http://inessential.com has some good stuff posted.