A little help to viewing ArcGIS Server, Geocommons, Arc2Earth, CartoDB, GIS Cloud, etc. vector data in a Leaflet map
This library will add Leaflet vector (Point, Polyline, Polygon) layers from multiple geo web services including ArcGIS Server, GeoIQ, Arc2Earth, CartoDB, GIS Cloud, etc.
Prefer Google Maps? Check out Google Vector Layers.
For details see the documentation and demos.