Here are some popular links to Amateur Radio websites.  The Internet is a valuable adjunct to the enjoyment of Amateur Radio.

Amateur Radio Research and Development (AMRAD)  Technical developments in Amateur radioarrl-diamond
American Radio Relay League (ARRL)  National Amateur Radio organization
Amateur Radio Satellite (AMSAT)  Amateur Radio Satellite organization
ARRL Atlantic Division  ARRL division covering NY, NJ, PA, DE and MD
Collegiate Amateur Radio Initiative Facebook group
DX Cluster — Current Activity  Most recent DX (distant) station activities
Federal Communications Commission (FCC)  FCC’s main web page
Morse Code Links  Information on learning and operating Morse Code
QRZ Call Sign Database  Address and station information
Repeater Directory  Database of VHF/UHF FM repeater systems in the United StatesARES
Tucson Amateur Packet Radio (TAPR)  Technical developments in Amateur Radio
Yahoo! Amateur Radio Page  Extensive links to Amateur Radio information

Here are some links to local Amateur Radio clubs in the Delaware Valley that welcome newcomers to Amateur Radio.

Holmesburg Amateur Radio Club  Amateur Radio Club based in Philadelphia, PA
Marple Newtown Amateur Radio Club  Amateur Radio Club based in Newtown Square, PA
Mid Atlantic Radio Club  Amateur Radio Club based in Radnor, PA
Spark Lodge Amateur Radio Club  Camp Delmont near Sumneytown, PAradio1934

Here are some links to State and Federal emergency services groups, an important aspect of Amateur Radio:

Emergency Management Institute (EMI)
Federal Emergency Management Agency (FEMA)
Pennsylvania Emergency Management Agency (PEMA)