Hello,
I just wanted to inform you about a website that I've been playing with for quite some time now. Powered by the University of Twente in the Netherlands, I give you... Wide-band WebSDR (http://websdr.ewi.utwente.nl:8901/).
Here you can tune into all sorts of shortwave frequencies and explore the invisible world of Radiowaves.
The sky is the limit with this FREE Web tool...(actually the limit is 25915 kHz but hey...that's quite a lot)
Have fun exploring peeps!
-johnylos