Jason Hinkle has a new blog post on VerySimple.com today about some recent work he's done to integrate Backbone.js and PHP (via the Phreeze framework's "Builder" tool).

Last year like a lot of other developers I started to get excited about client-side Javascript frameworks. [...] To me it’s basically a little bit of magic that makes your web application seem alive as it responds to any changes made to the data. Backbone.js is one such Javascript framework.

You can use the Builder as a part of the framework application or just use it as an example of how to integrate Backbone.js into a PHP application. The interface for it is nice and clean (and functional) and works with the frameworks' REST interface. You can see it in action in the video and live demo of the sample application.