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Stypi has support for code formatting and syntax highlighting, and lets you play back all your edits. To my knowledge etherpad did not have these features.

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Etherpad had playback (there was some famous instance of Paul Graham recording his entire process of writing an article).

You may be confused and thinking of this:

http://paulgraham.com/stypi.html

Which was Paul Graham using playback on Stypi

No, it was actually EtherPad. The link to it obviously does not work, unfortunately.

Actually, via the link, you can see that pg was using Stypi (I too thought it was EtherPad…). The link from the post works: https://www.stypi.com/hacks/13sentences

Edit: Okay, I was wrong. It was originally Etherpad: http://paulgraham.com/13sentences.html

FWIW, here is the HN link http://news.ycombinator.com/item?id=495336

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