Autodesk will soon introduce a free mobile version of the AutoCAD that will run on the iPad, iPhone and
Touch:AutoCAD WS mobile will be available soon. This free* mobile app will let you view, edit, and share DWG™ files on your Apple® iPad, iPhone and iPod touch®.
Together with the new AutoCAD 2011 for PC and Mac software, AutoCAD WS mobile app will make AutoCAD more accessible than ever for millions of professional designers and engineers worldwide. AutoCAD WS mobile is part of the Project Butterfly Technology Preview product release coming this fall.
via Autocad WS Mobile.