The latest version of Garmin Training Center also includes an export  to KML format, the XML-based format for Google Earth. This creates a wonderful view of my last run, in this case a round through Amsterdam's Vondelpark. 

You can also open the KML file directly by clicking on this link, as long as you have the .KML file connected to your Google Earth application. 

As you can see in Google Earth, each square represents a logging from my Garmin forerunner 305 GPS. It records ran distance, heartbeart and speed.