IRS - forms & publications:
www.irs.gov/forms_pubs/index.html

Social Security Administration:
http://www.ssa.gov/

Immigration and Naturalization Service
http://www.ins.gov/

Department of Labor:
http://www.dol.gov/

Pennsylvania Department of Labor & Industry:
http://www.dli.state.pa.us/

Office of Child Support Enforcement:
www.acf.dhhs.gov/programs/cse

New Jersey Department of Revenue:
http://www.state.nj.us/treasury/taxation/

Pennsylania Department of Revenue:
http://www.revenue.state.pa.us/

Berkheimer Associates (Local tax adminstrator):
http://www.hab-inc.com/

Philadelphia Deparment of Revenue:
http://www.phila.gov/revenue/index.html

Central Tax Bureau (Local tax administrator):
http://www.centaxgroup.com/index1.html

Department of Community and Economic Development
www.newpa.com