From where I sit, when flightmemory or any other site goes down, it's usually due to maintenance 99.9% of the time. Since you ask "Anyone know if its coming back?" with intimations of it's possibly being down forever in your title, it would seem you have reason to be concerned that it actually might not be coming back. Ever...

Just curious, dsauch, as to what drives this concern? Real evidence based upon past actions of flightmemory? I mean, should I be looking at posting my flights elsewhere...? Especially since some people think the Aztec calendar sez the world is going to end late next year and all...