This document discusses Ember.js and the related libraries backburner.js and rsvp.js. Backburner.js implements the run loop in Ember.js, allowing asynchronous operations like data bindings, actions, and rendering to be scheduled and coalesced. Rsvp.js is a tiny Promises/A+ implementation that provides tools for organizing asynchronous JavaScript code. It discusses how promises represent potential future values and examples of using promises in Ember.js applications. Contact information is provided for getting help building ambitious web applications using these libraries.