Here is an interesting site that will keep you busy for a while. 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.
To give it a try go to http://websdr.ewi.utwente.nl:8901/ and prepare to spend some time in front of it. It actually seems to work better for me on a mobile device such as a tablet or smartphone. The mobile site is http://websdr.ewi.utwente.nl:8901/m.html.