Chesapeake Energy Corp,the Oklahoma-based firm is the No. 1 driller in Ohio.
Rig Count Interactive Map by Baker Hughes, an energy services company.
Shale Sheet Fracking, a Youngstown Vindicator blog.
The Ohio Environmental Council, a statewide eco-group based in Columbus.
Earthjustice, a national eco-group.
People's Oil and Gas Collaborative-Ohio, a grass-roots group in Northeast Ohio.
Concerned Citizens of Medina County, a grass-roots group.
No Frack Ohio, a Columbus-based grass-roots group.
Fracking: Gas Drilling's Environmental Threat by ProPublica, an online journalism site.
Pipeline, blog from Pittsburgh Post-Gazette on Marcellus shale drilling.
Allegheny Front, environmental public radio for Western Pennsylvania.
Pennsylvania's Marcellus Shale Coalition is kicking off its first online business directory.
Marcellus on Main Street is designed exclusively to connect the natural gas industry with small- and medium-sized businesses in the region.
The site at www.marcellusonmainstreet.org is designed to bring together businesses and energy companies, contractors and suppliers in Ohio, Pennsylvania, New York, West Virginia and Maryland.
The site was launched on Tuesday at five locations across Pennsylvania.