Gmaps Pedometer http://www.gmap-pedometer.com is a neat online tool for those runners in this forum who want to calculate the distance of their running routes.
For instructions on how to use, click the link on the left margin entitled Usage Instructions. I run around my apartment complex, which is not listed on a Google map. However, by clicking on the Satellite button, I got a satellite photo of my complex and was able to measure my running route on it.
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The Running Room stores here have routes that are measured by GPS which they share with anyone, but I've not seen anything which lets you define your own route like this one does.
Here's another online tool for mapping and measuring running routes offered by USA Track & Field http://www.usatf.org/routes
The neat feature about this tool is its database of routes saved by other users. You can use it to look for new routes in your area, for routes when you're traveling, or for routes where you can meet other runners.