In episode ten of Skolnick’s Warcraft Less Traveled, he talked in great detail about The Dragons of Nightmare. To get the full story, I highly recommend you listen to that episode.
I did manage to travel to some of the locations mentioned in this episode before Cataclysm. Unfortunately, I was never lucky enough to see a dragon spawn from any of the portals, no matter how often I visited. My best guess is that my timing was never quite right. The screenshots you see in this blog were taken on January 15, 2012.