About three months ago, we had an article about Google Earth and Genealogy and about a blog, Students of Descent, that was describing how to use Google Earth in your genealogy research. Now they are in the process of tracking early migration in Pennsylvania:
I have spent a lot of time putting together this project on Early PA Migration, and I believe its finally ready to go public. What I am doing is mapping the migration of the early settlers of PA here on Google Earth and Indian villages from the Cessation days. Please keep in mind that this is an ongoing project and I expect to never be fully complete with it, as its concept keeps evolving.
As of now I have this tour start at the Port Of PA and moving westward via the various trails/paths that existed between the periods of about 1750 through 1850. I am also mapping out the various forts and Indian villages of that time period.