!!! Check out Backboned v2 with History-API-support - https://github.com/herschel666/Backboned-v2 !!!

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"Backboned" is a AJAX'ified WordPress-theme driven by the power of Backbone.js.

To handle the requests by Backbone.js a simple PHP-MVC with - a kind of - child-theme is implemented. The output is either a pure JSON-object for asynchronous requests, or static HTML for synchronous requests. This makes sure, search crawlers get content to crawl by replacing the hashbang with "_escaped_fragment_".

This solution is messy as hell, but this way makes crawlable AJAX-content possible without implementing a headless browser on the server.

Warning: I am a frontend developer. Therefore the PHP code isn't state-of-the-art, neat, performant, secure or whatever. So don't use this theme for productive usage!

Demo: http://emanuel.kodingen.com/wordpress/

And to prove crawlability oft the theme:

http://www.google.com/search?q=site:emanuel.kodingen.com/wordpress/