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I think this is an excellent presentation. It collects and distills a lot of best practice and common knowledge. I didn't learn much from it, but I do wish something like this had been available when I was learning Python, and will certainly recommend it to anyone wanting to learn Python.
David, thanks for posting this! It's quite timely as I'm currently revamping a lecture series I'll be giving at a local University. I hope you don't mind me stealing some ideas from your presentation!
Hmm, rather than 'Good Python Programming Practices' its called 'Idiomatic Python' so I guess a section on the need to test, and the availability of doctest may be out of place?