Using Google Earth for Jogging routes.

I'm sure i'm not the first person to think of this, but I found Google Earth really useful is setting jogging routes around my neighborhood. I my morning runs consist of anywhere between 1 mile and 2 miles. The length depends on if I want to go for distance or speed. Generally the shorter the run the faster I will try to run it.
Using Google Earth I found about 6 or 8 routes that range from 1 mile to 5.56 miles. The 5.56 mile route is my goal by spring.