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ArcGIS.com now allows you to easily add data by just dragging & dropping on your web map. Tabular Lat-Lon data in txt, csv or gpx files can do this but you need to be sure your coordinates are in Lat-Lon format for it to work. With help from Esri's Flex development team there is a new web app that allows you to quickly convert a non Lat-Lon CSV file to Lat-Lon:
