Geoprocessing & some other types of services at 10.1 support 'upload' capability.here is the REST API help on this topic: http://resources.arcgis.com/en/help/rest/apiref/uploads.htmlhere is a blog post which show how you can take advantage of that http://blogs.esri.com/esri/arcgis/2012/06/01/uploading-client-data-to-perform-thematic-mapping-on-th...