Gillian writes about a website which enables you to track your running and cycling performance:
They are now eons beyond Gmaps because while Gmaps will show you the google satellites and topography maps, MapMyRide will show me google’s new terrain maps which I much prefer! And they even show me the elevation of my intended (or already executed) ride, per feet and per miles! And you can change it to kilometers if you like. And it’s awesome. Did I mention that?
I like the concept. I’ve been logging a few of my recent, short, errand-filled rides around town. They also provide a way to search for recommended cycling routes. The site is clearly designed for more aspirational athletes, but I enjoy plotting my bike rides on the Google Maps-powered interface when I get home.
Speaking of interface, MapMyRide could use the attention of a serious interaction designer. The site is so crammed with menus, features and advertising–it’s a bit of a dog’s breakfast. I always have difficulty finding what I’m looking for. Which is too bad, because the underlying functionality seems robust.
DarrenBarefoot.com 
Heya. I’ve been using Nokia Sportstracker to GPS-track my runs and rides. I’ve been able to bring these into Google Earth, too. Thought you might be interested: http://clicknoise.net/using-gps-data-in-google-earth/
Also check out mapmytracks.com.
I’m a fan of the Daily Mile. “Social training and racing for runners, triathletes, and cyclists.”
http://www.dailymile.com/