With Google Earth Extension for AutoCAD users to perform an import Google Earth image into AutoCAD, publish 3D models from AutoCAD to Google Earth, and several other advantages. About Google Earth Extension for AutoCAD more please download the PDF it to AutoCAD 2008 (also for 2009 and 2010) and AutoCAD 2007.
To have just an update AutoCAD 2010, it is advisable to update this extension