- www.qrz.com – best place to lookup a callsign
- www.eham.net – great for gear reviews
- www.vanityhq.com – great place to help lookup available vanity callsigns
VHF and UHF:
- The Disaster Amateur Radio Network (DARN.org) – ARES for LA County
- WINSystem.org – large repeater network covering most of California and several other states.