|The University of Victoria online SDR from SDR.hu|
The site is run by Andras Retzler, the author of the OpenWebRX software that enables these SDR's to be made seamlessly available online through your web browser. Since all of the sites use the same software, all receivers appear the same, thus providing a very short operational learning curve. At the time of this posting, there were 76 online SDRs, a number that fluctuates slightly throughout the day. Conveniently, the site also indicates how many users are currently using any individual receiver.
I can think of several very handy uses of such a resource, from checking your own on-air signal to confirming, in real time, a suspected DX catch that you might be hearing from your own location. You may even be interested in putting your own SDR online for others to share. It really is a very useful resource and while there, check out the rest of Andras's interesting site.