Leslie M. Orchard built a Wiki prototype based on AJAX and Amazon's S3 storage service:

So, who knows how long it’ll stay up - or if it even works for anyone besides me in Firefox on OS X - but I’ve got an initial version of an S3Ajax-based wiki:

    * http://s3.amazonaws.com/s3wiki/wiki/StartPage

I’m using Stefan Goessner’s Wiky, to handle round trip conversion between wiki text and HTML. My S3Ajax handles all the I/O, tied together with a clunky wiki.js.

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