Adding topographic lines to Google Earth

I know many of you use Google Earth to to scout places beforehand, and have been doing that myself with some success for some time. I found an AWESOME improvement at the following link, and thought it might be helpful for some of you. No affiliation with the website creator or whoever made the page:

http://soleadventure.com/2012/02/how-to-add-topographic-maps-to-google-earth-2/

Its especially nice to use USGS maps, and you can modify the topo overlay onto the satellite imagery. Enjoy