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.... except that it's much faster to digest a talk + speaker notes than an endless video. (I'm not saying post notes instead. Ideally, post both)

This is the ideal solution. All the better if the presenter makes the online version more concise than the in-person presentation.

I recently tried this with something I talk about often, which is The Overview Effect and why I think it's important to think about in relation to data visualization. Using a tool that was more visual than a blog post, but not clickclickclick like slides + speaker notes was really helpful.

http://shashashasha.thenewhive.com/the-overview-effect

That is an awesome idea, I had missed that post of Zach's--which I count as a personal failure.