There's been a lot of interest recently in the development of natural gas from Marcellus Shale. If you have such an interest, you might find the following websites helpful: This one, from the Marcellus Shale Committee; this one, from the NY Department of Environmental Conservation; and this one, from the PA Department of Environmental Protection.
[Updated: Here's another website, from the Cornell Cooperative Extension of Tioga County. (Moved up.)]