I came to the comments on this one just to make sure this talk got mentioned as a counterpoint. Fantastic explanation of everything as he went along.

As I recall, he actually took the same conceptual problem and rewrote the solution in a handful of different concurrent styles.

And no, at least in this video I can not think faster than Dave Beazley can type. By the time I've just about figured out what nuance of concurrency he's showing off in his last example, he's already got his next example typed out!