Trello is the latest pet of Mr Joel Spolsky. It is a totally horizontal product, hosted only, delivered continuously, not exhaustively tested, work in public, aiming at “Get Big Fast”. The cutting edge technology behind the Trello: MongoDB, WebSockets, CoffeScripts, and Node. In its technology stack (Trello Tech Stack) on client side, it makes use of Backbone.js (client-side MVC), HTML5 pushState, and Mustache (templating language). In its client-side MVC design, it bases on a model held at the client, and an asynchronous process syncs down states from all over the web.