Watch for window resize and fire a one time event (instead of a possibility of firing hundreds).

app.js

// Backbone, jQuery, and Underscore needed

var App = {'Vent': {}};
App.Vent = _.extend(App.Vent, Backbone.Events);

var bodyView = Backbone.View.extend({
    el: $('body'),

    initialize: function() {
        this.resizePid = false;
        $(window).on('resize', this.resize);
    },

    /**
     *  Watch for window resize and fire off event for
     *  other views to use new dimensions
     */
    resize: function() {
        if(this.resizePid > 0) {
            clearTimeout(this.resizePid);
        }

        var _this = this;
        this.resizePid = setTimeout(function() {

            App.Vent.trigger('window:resize', {'width': $(window).width(), 'height': $(window).height()});
            _this.resizePid = false;

        }, 500);
    }
});

var someView = Backbone.View.extend({
    initialize: function() {
        App.Vent.on('window:resize', this.windowResized);
    },

    windowResized: function(options) {
        console.log(options);

        // do resizing stuff here.
    }
});

new bodyView();
new someView();