NEOGAP is an Ohio-based group that follows the issues surrounding oil and gas development (particularly in Ohio) and has a wealth of excellent information on thier website. I encourage everyone to check out http://www.neogap.org/. I also encourage folks to review this article from NEOGAP:
Again, this document focuses on Ohio but much of it applies here. They hit topics like safety, contamination, inadequate staffing of State inspectors, whether or not this will help defer our dependence on middle-east oil, and more. It's also a well-referenced document.