Over the last few days I have been playing around with Google Maps. To be more precise, I have been building an online pedometer tool for Wendy Bumgardner over at walking.about.com. Users can draw their walk on the map and the tool tells them how long the route is as well as giving the user the ability to bookmark a walk etc.
The script that does all the work is here (after you download it remember to remove the .txt extension). I will be adding to it and improving it during the coming weeks. Feel free to use it for your own purposes.