While the ArcGIS Javascript Api continues to be very popular, many of our users out there are interested in leveraging some of our Open Geospatial Consortium (OGC) Service implementations using Javascript client libraries from http://openlayers.org. No problem.
The following link (http://dtc-sci01.esri.com/OGCApps/OpenLayersApp/) put together by Kevin Sigwart (Esri) has a nice set of links that provide help for users wanting to leverage OpenLayers against services from an ArcGIS Server.
Click on the links to see how they work. As the services here may not be permanently available, we would advise you to go ahead and download the code from github (https://github.com/kevinsigwart/EsriOpenLayersClient) and set up the examples to work against some of your own services.
Enjoy!!
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