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A couple years ago I had a couple months fun making several hundred JT65 contacts via HF.   It was a fun challenge and I love QRP modes anyway.  As I'm "back into HF" and other things now I revisited JT65, and found that the JT9 software has matured as well.    The last time I tried it the software was clunky and I didn't find any sigs.

Well today, it seems both are better.  I found sigs and good software, in the form of WSJT-X.

http://www.physics.princeton.edu/pulsar/K1JT/wsjtx.html

The JT9 signal is designed for HF, and boasts the ability to copy 2db deeper into the noise while being about 5 times narrower in bandwidth.  Well I'm not sure about the noise boast, but it surely is narrower as the image below shows.

b_200_200_16777215_00_images_2014-02-22_10-35-16a.png

I'll be on JT65 and JT9 modes off and on, between DSSTV and other fun modes.

 [Update] JT9 pulled out a signal that I couldn't see a trace of in the waterfall.  It was on the end of a qso that had already been established, and it pulled out the 73 that I couldn't see in the waterfall, let alone hear.