I've taken an interest is QRSS, super slow CW. A sound card DSP program, like Spectrum Lab, or Argo, is used to listen on a certain frequency. The "visual decode" is continuously posted on the internet as a picture.
Right now, I'm looking at the main center of worldwide activity, 10.140 MHz, 30M. When we finally get access to one of our LF bands, I'll probably move there.
My Grabber receiver can be "seen" at : http://www.qsl.net/w6iee/