Keyhole has released a detailed tutorial of the KML format that is used in Google Earth. The KML Document details everything you need to know to create and share information with the Google Earth client. If, however, you would like to jump right in and see some real examples of what you can do with KML, then that tutorial is for you.

Be sure to download and browse the KML tutolrial file by just clicking on it. It holds amazing examples of how to bound extra information (images, 3d, html) directly into your Google Earth interface.
Google Code: Google Earth KML Tutorial
Google Earth KML Documentation

Be sure to download and browse the KML tutolrial file by just clicking on it. It holds amazing examples of how to bound extra information (images, 3d, html) directly into your Google Earth interface.
Google Code: Google Earth KML Tutorial
Google Earth KML Documentation