General Genealogy Sites
US GenWeb
Genealogy Gateway to the Web
Family Search (LDS)
Genealogy Toolbox 
Genealogy Portal
Genforum
Cyndi's List of Genealogy Sites on the Internet
Rootsweb
Distant Cousins
Ancestry.com
Palatines to America
Mid-Atlantic Germanic Society

Pennsylvania Genealogy Sites
PA GenWeb 
Pennsylvania German Society
Pennsylvania Maps
Historical Maps of Pennsylvania
Cyndi's List of Pennsylvania Genealogy Sites
Cyndi's List of African American Genealogy
African American Genealogy Group
Slavery in Pennsylvania
Slovenian Genealogy Society

Pennsylvania Historical and Genealogical Societies
Pennsylvania Federation of Museums and Historical Organizations
The Historical Society of Pennsylvania
The Pennsylvania German Society
Genealogical Society of Pennsylvania
German Society of Pennsylvania
Jewish Genealogy of Pennsylvania
Mennonite Historians of Eastern PA
Swedish Colonial Society
Presbyterian Historical Society
Lancaster Mennonite Historical Society
The Balch Institute for Ethnic Studies

National Sites
National Archives and Record Administration
Library of Congress
National Park Service Underground Railroad
National Park Service Gettysburg Battlefield

Libraries
State Library of Pennsylvania
Carnegie Library of Pittsburgh
Penn State University Library

If you need further assistance, you may contact an archivist at ra-statearchives@pa.gov