Chosen.js v0.12 implementation in Ember 1.0.0.

App.ChosenSelect.js

App.ChosenSelect = Ember.Select.extend({
    chosenOptions: {width:'100%', search_contains: true},
    multiple:true,
    attributeBindings:['multiple'],

    didInsertElement: function(){
        var view = this;
        this._super();
        view.$().chosen(view.get('chosenOptions'));

        // Observes for new changes on options to trigger an update on Chosen, 
        // assumes optionLabelPath is something like "content.name"
        return this.addObserver(this.get("optionLabelPath").replace(/^content/, "content.@each"), function() {
          return this.rerenderChosen();
      });

    },
    _closeChosen: function(){
        // trigger escape to close chosen
        this.$().next('.chzn-container-active').find('input').trigger({type:'keyup', which:27});
    },

    rerenderChosen: function() {
        this.$().trigger('chosen:updated');
    }
});

template.hbs

{{view App.ChosenSelect
    contentBinding="options"
    valueBinding="selectedOption"
    optionLabelPath="content.name"
}}