A bit late to the party, but for those reading this now, we (Safe Software) released a free SHP to TDE converter that does exactly what James DuBois asked; namely upload and convert ArcGIS polygons into Tableau polygons without having to download any software. You can try the converter out at www.safe.com/free-tools/shapefile-to-tableau/ It's only been out for a week, so if you have any feedback, please let us know. If you want to pull in data from other sources, like a File Geodatabase, or need some transformation, we also recently added write support for Tableau Data Extract (TDE) files as of FME Desktop 2016.1.
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