The Rotaville web interface is mixture of backbone.js models along with my own solution for view routing, view rendering/templating and also keyboard controls.
Rotaville mobile is available on the web and also iOS and Android (using phonegap/cordova). The backbone.js models are re-used from the web app. jquery-mobile is used for the view styling and transitions.
Sorry, diod not phrase my question right. I meant to ask what is the UI framework you used? The one that creates touch phone like interface and look-n-feel.