The people over at Eyebeam recently launched a new tool, entitled Maya 2 Google Earth. It's an open-source, cross-platform tool that allows you to export 3D models as a single Google Earth Placemark (KML) file. The project was inspired by the Open GL extraction utility OGLE (also by Eyebeam), which allows for the capture and re-use of 3D geometry data from 3D graphics applications running on Microsoft Windows.
Some of the potential uses for Maya2GoogleEarth are:
-Remix or augment city architecture, with your own creations
-Extract your in-game character with OGLE and bring them into Google Earth
-Design buildings and then show them at their correct geographic location
They've even stated that the first person to have Godzilla attacking Tokyo will have it posted to the site.
The image above are of gnomes from MMP online game WoW implemented into Google Earth.