You can go to the Apple Website to get it downloaded - AutoCAD WS Apple, also the Android Market. You can go to the AutoCAD WS website to learn more about it - AutoCAD WS. You can also check it out on their YouTube channel at Autodesk AutoCAD WS YouTube.
Here is What's New in Version 1.4:
- 3D interactive viewing - view and share 3D drawings on mobile devices
- GPS geo-location features - orient yourself within a drawing, and share/save comments to geographic locations
- Plot to Print - print remotely from within the app using HP’s ePrint & Share service
- Plot your designs to PDF or DWF and share them via email
Here are some YouTube videos showing the functionality shown at Autodesk University 2011.
AutoCAD WS in 3D
Using GPS with AutoCAD WS
Plot from you Mobile using AutoCAD WS
AutoCAD What's New Features Image Credits: AutoCAD WS Blog