As there are lot of comments here, thought about clarifying few points in that article 1) About clean separation of concerns. A lot of customers expect you to

As there are lot of comments here, thought about clarifying few points in that article 1) About clean separation of concerns. A lot of customers expect you to cleanly separate your client side javascript/css/artifacts from your server side implementation. Even to an extent where you can just take it and repackage the same with minor modifications using a container like Phonegap, and distribute it for mobile devices later. HTML5's significance is beyond web - it can take your app beyond the browser. 2) About the REST Layer Anyway you are investing in building a web application, so you need to ensure the plumbing portion is re-usable beyond your traditional 'website'. If you want to build a native phone application or a Chrome plug in tomorrow, you should be able to use the same service layer.