Here are some helpful links:

Health:
Aetna (www.aetna.com)
Blue Cross (www.ibx.com/broker_forms)
United Healthcare (www.uhc.com)
United Concordia (www.ucci.com)
Caremark (www.caremark.com)

Government:
Medicare (www.medicare.gov)
Social Security (www.socialsecurity.gov)
PA Dept. of Aging (www.aging.state.pa.us)

Dental:
Delta Dental (www.deltadental.com)
DentaMax (www.dentamax.com)