The Center for Healthy Environments and Communities, part of the University of Pittsburgh Graduate School of Public Health, has an excellent up-to-date map that features locations of all wells completed and those under permit in Pennsylvania. The database is maintained by Matthew Kelso.
A visit to the site will open your eyes regarding all the activity in Pennsylvania related to the Marcellus shale natural gas play. Take a peak. The interactive site allows you to zoom right in to the well sites, and move across the landscape. There could be wells located near one of your favorite hunting or fishing spots. – Roxane Palone