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Exclusive: How LinkedIn used Node.js and HTML5 to build a better, faster app

The app is two to 10 times faster on the client side than its predecessor, and on the server side, it’s using a fraction of the resources, thanks to a switch from Ruby on Rails to Node.js, a server-side JavaScript development technology that’s barely a year old but already rapidly gaining traction.

VentureBeat
Backbone.js
Underscore.js

Nice additional reading:
Offline Web Applications

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