Google Earth for Developers
With the Google Earth Plug-in and its JavaScript API, developers can embed the full power of Google Earth and its 3D rendering capabilities into web pages. Using the API you can draw markers and lines, drape images over the terrain, add 3D models, or load KML files, allowing you to build sophisticated 3D map applications. If you have an existing Maps API site, you can 3D-enable your page with as little as one line of code.
Visit the Google Earth API SiteGoogle Earth API Demo Gallery
Go to the gallery-
Driving Simulator
Tour your driving directions in 3D
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Monster Milktruck
Drive the milktruck across cities around the world
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Mini Flight Simulator
Fly anywhere in the world in this flight simulator game
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China Syndrome
See what's on the other side of planet
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Sport Stadiums
Tour several American stadiums in 3D
Google Geo Developers Blog 
