Bulp, you may not have been aware of this, but there's already a list for the three games as a whole, over at aeoncontinuum. I've got a pretty comprehensive master list of game discussion LJ communities over at WolfSpoor (along the left-hand side). If I may do a little plugging, you can get WolfSpoor news on your friends list by adding wolfspoor, or you can go to the site and access certain news directly, like http://www.wolf-spoor.org/aeoncontinuum or http://www.wolf-spoor.org/trinity.
I don't think this community is necessarily useless simply because there's already one, however. After all, there's a community for general World of Darkness stuff as well as communities for each respective game, like Vampire or Werewolf. I think this community could nicely serve as a Trinity-specific community. I know I'd use it.
Just my opinion, YMMV.