OnTheShortWaves.com - http://www.ontheshortwaves.com/
Devoted to the history of shortwave broadcasting and the shortwave broadcast DXing hobby.
Radio Monitoring At Its Finest - http://www.strongsignals.net
Features the latest news and reviews for beginners and experts alike.
This Week in Amateur Radio - http://www.twiar.org/
Features the latest news and has many special features on various items involving technology and amateur (ham) radio.