leaflet.js

    // Simple helper function for setting up a leaflet map.
    var Leaflet = {
        defaults: {
            zoom: 13,
            attributionControl: false
        },

        map: function(mapId, options) {
            options = (options || {});
            options = _.defaults(options, this.defaults);

            var map = L.map(mapId).setView([
                        options.lat, options.lon], options.zoom);
            L.tileLayer('http://{s}.tile.cloudmade.com/' + app.leaflet.apiKey + '/997/256/{z}/{x}/{y}.png', {
                maxZoom: 18
            }).addTo(map);

            var marker = L.marker(
                [options.lat, options.lon],
                {icon: new L.Icon.Default()}
            ).addTo(map);
            return map;
        }
    };