21st Century Radio – Dr. Bob Hieronimus; Fascinating programmes on many topics, ranging from science, archaeological discoveries; alternative history; call-in talk radio; many other resource links on this site:
http://www.21stcenturyradio.com

Coast to Coast – with legendary US-host Art Bell and guests; call-in talk radio; many links to a great variety of sites; from the sober to the downright bizarre:
http://www.artbell.com

Laura Lee – With Washington-state based Laura Lee; many thought-provoking and intereting subjects; call-in talk radio; good resource links and archives here:
http://www.lauralee.com

Discovery Channel – The cable and satellite provider of, in particular, the Discovery Civilizations channel; here is a link to the History home page of their website:
http://dsc.discovery.com/guides/history/history.html

The Jeff Rense Show – With popular US-based radio host Jeff Rense, who came to fame with his ‘Sightings’ show; call-in talk radio; the weird and the wonderful; many links here:
http://www.rense.com

History Channel – rather a “busy” site to find your way around, but the search facility can turn up some interesting things:
http://www.historychannel.com/