The Google Earth Extension is now available for all AutoCAD 2011 based products in both 32 bit and 64 bit versions.
Using the Google Earth Extension‘s simple wizard-driven interface, you can publish your 3D models from AutoCAD directly into the Google Earth application. The technology preview also allows you to import a Google Earth image into AutoCAD, publish your 3D model to Google Earth, drape a Google Earth image onto a 3D mesh in AutoCAD, and attach time span information to your model.
Click here to download the Extension.