WebSDR on 20m, 40m and 80m in JO32KF
http://websdr.ewi.utwente.nl
"On this page you can listen to and control a short-wave receiver located at the amateur radio club ETGD at the University of Twente. In contrast to other web-controlled receivers, this receiver can be tuned by multiple users simultaneously, thanks to the use of Software-Defined Radio."