Pennsylvania Resources

Statewide
Pennsylvania State Archives Birth and Death Records 1906+ (free index, pay for records - soon to be on ancestry.com as well)
Genealogical Society of Pennsylvania (free and pay)
Historical Society of Pennsylvania (free and pay)
Access Pennsylvania Digital Repository (free)
Historical Maps of Pennsylvania (free)
FamilySearch.org PA Collections (free)
Ancestry.com PA Collections (pay)
PA Civil War Era Newspaper Collection (free)
PAGenWeb Project - includes project for each county (free)
PA-Roots - includes county pages (free)

Alphabetically by County or City
Adams County Genealogy Records Info (pay)
Adams County Historical Society (pay)
Allegheny County Birth and Death Records at Carnegie Library (pay)
Allegheny County Genealogy Research at Courthouse (pay)
Armstrong County Genealogy Records (pay) - scroll down to "genealogy"
Armstrong County Genealogical Society Research (pay)
Beaver County Register of Wills (pay)
Beaver County Historical Research and Landmarks Foundation Archives (free)
Beaver County Genealogy and Research Center (free and pay)
Bedford County Archives (probably pay)
Bedford County Historical Society (pay)
Berks County Register of Wills Index Search (free index)
Berks County Genealogical Society (pay)
Blair County Genealogical Society (free and pay)
Blair County Historical Society (free and pay)
Bradford County Register & Recorder (pay)
Bradford County Historical Society (pay)
Bucks County Genealogical Society (free and pay)
Bucks County Historical Society (pay)
Butler County Historical Society - Genealogy (free and pay)
Butler County Genealogy Society (pay)
Cambria County Register of Wills/Clerk of Orphans Court (pay)
Cambria County Historical Society (pay)
Cameron County Historical Society (pay)
Cameron County Genealogy Club (free and pay)
Carbon County Mauch Chunk Historical Society (free)
Carbon County Dimmick Memorial Library (free and pay)
Centre County Genealogical Society (pay)
Centre County Historical Society (pay)
Chester County Archives and Records (free and pay)
Chester County Historical Society (pay)
Clarion County Register and Recorder's Office (pay)
Clarion County Historical Society (pay)
Clearfield County Register of Wills (pay)
Clearfield County Historical Society (pay)
Clinton County Register and Recorder - Genealogy (pay)
Clinton County Genealogical Society (pay)
Clinton County Historical Society (pay)
Columbia County Historical and Genealogical Society (free and pay)
Crawford County Clerk of Courts (pay)
Crawford County Historical Society (pay)
Cumberland County Archives (pay)
Cumberland County Historical Society (pay)
Dauphin County Register of Wills (pay)
Dauphin County Historical Society (pay)
Delaware County Archives (pay)
Elk County Historical Society (pay)
Erie County Historical Society (pay)
Erie County Courthouse Records (pay)
Fayette County General Records Info (pay)
Fayette County Genealogical Society (pay)
Forest County Courthouse (pay)
Franklin County Register and Recorders Office (pay)
Franklin County Historical Society (pay)
Fulton County Historical Society (pay)
Greene County Clerk of Courts (pay)
Greene County Genealogical Society (free and pay)
Greene County Historical Society (pay)
Harrisburg City Archives (pay)
Huntingdon County Register and Recorder (pay)
Huntingdon County Historical Society (free and pay)
Indiana County Courthouse Naturalization Records (free index)
Historical and Genealogical Society of Indiana County (pay)
Jefferson County History Center (pay)
Juianta County Historical Society (pay)
Lackawanna County Register of Wills Genealogy Research (pay)
Lackawanna County Historical Society (pay)
Lancaster County Archives (pay)
Lancaster County Historical Society (free and pay)
Lancaster Mennonite Historical Society (free and pay)
Montgomery County Historical Society (pay)
Montgomery County Archival Records Retrival (pay)
Greater Philadelphia GeoHistory Network (free and pay)
Philadelphia City Archives (free research, small fee for copies)
Philadelphia Historic Streets Index (free)
Historic Pittsburgh (free)

By Other Regions or Cultures
Capital Area Genealogical Society (pay)
Mid-Atlantic Germanic Society (free and pay)
Moravian Archives (pay)
Moravian Historical Society (pay)
Pennsylvania German Society (pay)
South Central Genealogical Society (pay)
Tri-Counties Genealogy and History (Bradford, Tioga, and Chemung) (pay)
Tri-County Historical Society (Berks, Chester, and Lancaster) (free and pay)
Western Pennsylvania Genealogical Society (free and pay)

Other Resource Lists
PA Statewide Resources from the Genealogical Society of PA
PA Regional Resources from the Genealogical Society of PA
Wikipedia List of Online Newspaper Archives of PA (free and pay)
List of where to find marriage and divorce records by county (pay)

This list is a work in progress, please respond if you know of any good PA resources not listed.