Amateur Radio World-Wide - NW7US- HF radio propagation, operation, equipment, as well as amateur (HAM) radio in general, and also a large collection of SWL, Shortwave and DXing resources.
HFCC - High Frequency Co-ordination Committee- Group active in informal co-ordination of frequency channels used in short wave broadcasting. The group co-ordinates transmission schedules of about 60 organisations from more than 30 countries.
On The shortwaves.com- Devoted to the history of shortwave radio and the shortwave DXing hobby, this site includes early radio articles, book reviews, and other references for DXers and collectors.
R.L. Drake Virtual Museum- Presents a Drake online catalog and illustrations covering products from the 1958 R1-A to the present R8 line, including accessories.
Spy Centre- A resource for information about Shortwave Spy Number Stations.
Spy Number Stations- Numbers stations, shortwave spy stations, spooks, russian KGB and The Lincolnshire Poacher, among others.
The Annual Winter SWL Festival- The largest annual gathering of shortwave listeners in North America, if not the world, near Philadelphia in March.
The DX Home Page- From Klaus-Dieter Scholz, includes DSWCI news, shortwave schedules, station news, radio station addresses, ITU abbreviations list and tips for shortwave newcomers.
The KA3NRX Shortwave Radio Link Page- A page that provides links to shortwave radio stations around the world and also includes other links concerning world band radio.