Here Autodesk's Adam Perry demonstrates the iPad version of their free AutoCAD WS software, a mobile application that allows users to view, edit and share CAD drawings on-the-go. While the web-based version is more full-featured, the iPad app allows viewing, annotation, editing, and even some primitive CAD moves; perhaps most importantly, it does "real" DWG, eliminating open-source DWG's translation problems.
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