We have updated the Autodesk Labs hosted tool "Google Earth Extension for AutoCAD" which included fixes for reported issues and support of other products like AutoCAD Map. The credit and kudos goes to the developer Thomas Inzinga. With this updated tool you can import images or a mesh from Google Earth, assign time span, and also publish your models to Google Earth.

http://labs.autodesk.com/utilities/google_earth_extension_beta/ 
(not really a beta but a Autodesk Labs Technology Preview)

Changes:

Added support for AutoCAD® Map 3D 2008.

Added support for map projections when using the extension with AutoCAD® Civil 3D 2008 or AutoCAD® Map 3D 2008.

Added tool tips for displaying time span data attached to AutoCAD entities.

AutoCAD® block references are now published without the need to explode them.

Included a number of minor defect corrections.

Email feedback to: [email protected]

Thomas will also have a class on this tool at Autodesk University "Publishing DWG Data to Google Earth (GD405-1)".

Come join us at Autodesk University while this year we are celebrating 25 years of proven industry excellence by Autodesk.