Travel Tracker Sports Mate
The domain lets you upload a GPX file directly from your GPS unit.
Visualization: options like ‘playback’ and heart rate against time/altitude.
Prove to your mates how fast you did a journey and lets THEM see areas where you slacked it off.
They’re publishing a KML visualization of the Alp d’Huze race in France today in real-time to run on the site coincidentally with the racers undertaking the course.
As far as I know, this is an Internet first for real time visualisations.