Greetings,
Using data from Strava, the animation in the following link visualizes riders as they trundled along the route.
http://veloviewer.com/VeloFlow.php?segmentId=2234059&date=2012-10-28&activityId=26334016&athleteId=333716
1. Click ALL RIDES
2. At the Map screen, select Auto Center, then press Play. Zoom in and out as necessary.
I'm the blue dot in the animation.
This can be done with any ride recorded on Strava, but it's effect is best seen at races / organized century events. If you have questions about making your own cool animation, drop me a line.
Enjoy,
Jayson