I gave a talk last night at the Ember London about integrating Ember into existing sites.
In particular, I walked through how I use Ember on Endless Rotation and explained the reasoning behind some of the tech decisions.
The decisions lead to the creation of a hybrid site where the server rendered HTML is enhanced using Ember and pjax is used to make the Ember components long lived.
The talks were recorded, so I'll link to the video when it goes online. In the meantime, here are the slides.