National Radio Data
An on-line subscription-based provider of nationwide scanner frequencies, trunked frequencies, ham radio, and mass media for DXing. National Radio Data also provides worldwide airport frequencies, civil aviation registry information, public service information, and more.
http://www.nationalradiodata.com/

The Southgate Amateur Radio Club
Features amateur radio news updated daily, plus a selection of radio articles, circuits and designs - and a large dash of humour too!
http://www.southgatearc.org/