Radio
AsiaWaves - http://www.asiawaves.net/
Searchable database of Asian radio and TV broadcast stations categorized by country. Includes radio frequency tables and audio recordings archive.
Radio Amateur Ring - http://www.radio-amateur-ring.com/
Web ring and community for hams. Includes discussion forum and chat room.
SWLfest - http://swlfest.com/
Annual convention of radio listening enthusiasts from around the world at Kulpsville, Pennsylvania. Includes registration form, event info, blog and mailing list.