luxleviathana (firstname.lastname@example.org; luxifermalfoy on AIM) should be contacted about all things plot.
willfully (email@example.com; in quicksand on AIM) should be contacted about plot summaries, points, or organizational things.
shotgundivorce (firstname.lastname@example.org; shotgundivorce x on AIM) is our omniscient and helpful HM, who can really be contacted about anything.
trivalent and xxjinxxx are the modly minions, who will be taking care of things like the application/character list, Quidditch, and room assignments - their duties may well change as the term continues and will be made apparent.
There is also a generic feedback post for members here.