Above is an an example of the new track feature in Google Earth 5.2 (released today) showing a bike route to work. You could/can use these new features to do all sorts of great data logging and display.

Visualize your hiking, biking, and running tracks – Google Earth has always been a great tool for viewing your outdoor activities, whether it be hiking, running, biking, skiing, sailing, or just about any other way you choose to explore the world. With the release of Google Earth 5.0, we added the ability to connect your GPS device directly to Google Earth and import your track. Now, with Google Earth 5.2, we’ve added the ability to view elevation, speed, and other data as a graph directly in Google Earth. Just connect your GPS device to upload your track, and select “View Elevation Profile” from the menu. This will bring up elevation and speed graphs. If your GPS device records additional information such as heart rate or cadence, these will also be available to view in the graph. You can also see statistics such as total elevation, maximum slope, and average speed. You can select a portion of your ride and get statistics for just that section.