Quickly and easily add links to your blog posts, which when clicked, starts up the Google Earth program at the specified location (lat/long).
Download and unzip the plugin into your /wp-content/plugins/ directory.
Activate the plugin through the 'Plugins' menu in WordPress.
Sign up for the Google Maps API - its quick and easy to do.
Configure your browser to open up Google Earth kml links without the annoying prompts - optional but highly recommended.