Suggested resources for learning about blocks

Question

What are some good suggested resources for learning about blocks and GCD in Mac OS X and iOS

Answer 1

Adding a bit more to my own question.

Blocks and GCD have been around for a couple of years now, so the online docs have been supplemented by other online resources. Even some of the iOS teaching books cover the subject.

However, the new book by Mark Dalrymple Advanced Mac OS X Programming has a couple of deeper chapters on Blocks and GCD that are of interest.