Cram Johnson was Tony
Grip Johnson was his business partner Nelson
Phil Ownesmouth was John Strong
MNike Volpini was a director for Kick Ass Pictures.
Tranzer never posted much because ADT found out he was underage and banned him for several years.
Saevus Maximus was Jim Powers
Smartt was a Brazillian tranny rapist named Sergio. He went postal one day aftedr jamesn and have2cit goaded him for about 3 days.
Smelly Monkey was originally Mike, the producer of Frank Wank. After he got bored they just passed the name around the office when someone wanted to throw a grenade.

Here's the background on how/why XPT started up: http://forum.jerkoffzone.net/ubbthreads/ubbthreads.php?ubb=showflat&Number=145709