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There's a lot in there about specifically what they did, with repeated cautions not to overcomplicate a scaling solution.

For most of us on HN, though, I think only these slides are needed:

180 don't over-optimize or expect to know ahead of time how site will scale

184 few, if any, unsolvable scaling challenges for a social startup

185 have fun

Despite usually hating viewing slides without the presentation, I actually find this style very good for getting the point across.

Hammer down and there are some good quotes/ideas in there.

They basically wrote most of it down, which could be easily excerpted into, say, some normal text that one could quickly read.